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.he CHAPTER 1 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
HOW DO YOU SWAGE BULLETS?
There are five different ways to swage bullets today. You can
use:
(1) A POUND DIE
(2) A RELOADING PRESS
(3) The CORBIN MITY MITE PRESS
(4) The CORBIN MEGA MITE PRESS
(5) The CORBIN HYDRO-PRESS
Each of the five methods has certain advantages. The pound die
requires no press, but instead, uses a mallet. It is somewhat lower in
cost because you do not need to purchase a press, but it is much slower
to use and doesn't produce jacketed bullets. It is ideal for swaging
large caliber lead bullets, and is often selected by replica black-
powder rifle shooters who wish to use an authentic reproduction of the
earliest form of swaging die (from the 1890's).
The reloading press system is economical since most handloaders
already own a suitable reloading press. It is limited to smaller rifle
calibers (from .257 to .224) and medium handgun calibers (from .357 to
.25 ACP) because of the inherent weakness of the slotted ram. There
are certain design restrictions imposed on this system by the press, so
it is not ideal for special work or custom calibers. Corbin makes
standard calibers and shapes only, in this system. The cost is thus
kept low for the quality. Speed is greater than the pound die but less
than the other, special swaging systems.
The Corbin Mity Mite system uses a special horizontal ram press
with more power than any reloading press built. It is much faster than
a reloading press since it ejects the bullet automatically on the back
stroke. The dies for this system, and the matching punches, do not
interchange with the reloading press system. They are made to fit into
the RAM of the press, instead of the press head. Calibers from .14 to
.458, tubing jackets with walls of up to .030-inch thickness, and
weights up to 450 grains, can all be swaged with the Mity Mite. Custom
work is done in this system.
The Corbin Mega Mite system is based on a massive machined steel
press that can handle both reloading and bullet swaging. It can accept
ANY of the Corbin dies, including those for the Hydro-press. This
ability to interchange various kinds of dies can be important to some
owners. However, there are limits to any hand-powered press. The
amount of force the Mega Mite produces is awesome, but still less than
required for certain large caliber, heavy-jacketed production work.
The Corbin Hydro-press system is the ultimate in bullet
manufacturing today. It features automatic stroke and pressure
control, electronic sensors and timing, programmable stroke control,
and many other advanced concepts that place it at the top of the list
for custom bullet firms around the world. Any caliber from 20mm cannon
to a 10 gauge shotgun slug can be swaged, in virtually unlimited weight
or style. Solid brass or copper rod can be formed instantly into
bullets of higher precision than lathe turning. Lead wire can be
extruded like toothpaste. And the press adapts easily to standard
reloading dies for the convenience of automatic sizing and seating.
Any of the various swaging systems use the principle that cold
metal will flow under sufficient pressure and take on the shape of the
vessel holding that pressure. The swage die is a very strong, highly
finished vessel for containing the pressure. You swage the bullet in
all these systems by driving a punch against the material while it is
held within the confines of the die cavity. Upward expansion from the
internal pressure created is the key factor in forming the bullets.
Reduction in diameter is called "drawing". Remember, swaging always
expands the bullet or material upward in diameter.
Drawing dies are used to reduce the diameter of an object, such as
a bullet or a piece of copper tubing or a jacket. They differ from
swaging dies, in that the drawing die has an open top and only one
punch is used. The component is pressed through the die and out the
top. In passing through a hardened constriction, it becomes smaller.
Drawing has serious restrictions when applied to finished bullets, and
can only be used for very limited amounts of reduction. But for
reforming jackets and making copper tubing into jackets, it is a
valuable tool.
If you try to put a piece of lead or a jacket into a die that has
a smaller diameter of cavity, the material will be forced down in size
and will exert a strong pressure against the sides of the die. When
the pressure is relieved, by ejecting the component, the material may
exert a certain amount of springiness, and become slightly larger than
the die cavity. In making swage dies, the die-makers have to contend
with the various amounts of spring-back in different hardnesses of
jackets, different thicknesses of jacket wall, and other factors. The
die itself is normally a different diameter from the actual finished
bullet that comes out of it.
What this means to you as a potential bullet-maker, is that you
should NEVER try to force anything into a swage die. If it won't fit
easily, don't push it in. At best, it will make the wrong diameter of
bullet. But generally, it will stick fast in the die and require
special techniques to remove. And at worst, it can generate enough
pressure to break the die!
In the following chapters, we'll discuss the various methods of
making bullets in more detail, one system at a time. Bear in mind that
there are hundreds of possible variations on the techniques, depending
on what you want to make. It would be impossible to send this manual
to you by mail if every style of bullet were to be described detail,
with each step required to make it. We have to give you the basics of
making two or three styles, and refer you to the more detailed
technical books for advanced techniques.
It is far more important for you to understand the principle
differences between lead bullet swaging, semi-wadcutter (and jacketed
wadcutter) styles of swaging, and the styles that bring the jacket into
the nose curve or ogive portion of the bullet. These three basic kinds
of bullets form the basis for everything else. If you understand how
to make them, then variations such as rebated boattails, liquid-filled
internal cavities, partitions, and other advanced designs are fairly
simple to pick up. They aren't different: they just expand a bit on
the basic techniques.
.he CHAPTER 2 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
MAKING THE LEAD CORES
The two main components that go into most bullets are the lead
filling, or core, and the outer skin, or jacket. We'll talk about
jackets in the next chapter. Right now, let's make some cores.
There are two main sources for lead cores. You can purchase a
spool of lead wire in the proper diameter, along with a core cutter,
and chop off accurately-measured lengths. Corbin has lead wire in pure
175,000 grain spools (LW-25), and the PCS-1 Precision Core Cutter to
cut them. The core cutter has an adjustable stop screw that adjusts
the amount of lead cut on each stroke of the tool.
The second source is your own supply of scrap lead, the same as
you might use for bullet casting. Corbin makes a 4-cavity, adjustable
weight core mould that mounts to the reloading bench. You don't have
to pick it up, and there are no handles required. Four pistons,
precision fitted to four cylinders, slide up and down to eject the
cores. The bottom position is set by a rest plate. This steel plate
rests on a pair of nuts, fastened to two threaded rods at either end of
the mould.
Adjusting the nuts upward decreases the volume in the cylinders,
and gives you a lighter core. Pouring molten lead into the top of the
mould fills all four cavities. Moving a long sprue cutter chops off
the lead at the top of the cavities, leaving even lengths of lead to be
ejected straight up from the cylinders. The process is very fast,
making it possible to produce at least 1000 cores per hour.
Lead wire can also be manufactured at home. Corbin makes a lead
wire extruder kit for the Hydro-press, capable of making lengths of
lead wire from lead billets. Lead wire can be extruded in special
shapes, as well, for use in stained glass work or as hollow tubing used
for fishing sinker wire. The LED-1 Lead Extruder Die set comes with a
selection of popular diameters of interchangeable dies, all of which
fit into a master body. Included with the kit are billet mould tubes
to form the proper diameter of lead cylinders for extrusion. These
special forms can be the basis of additional income for the Hydro-press
owner. Hand presses do not have sufficient stroke or power for
commercial lead wire extrusion.
Small diameter lead wire for the sub-calibers (.14, .17, and .20)
can be produced in the Corbin hand presses with the LED-2 extruder kit.
Only relatively short lengths are made at one time, but they are very
economical sources of cores for the tiny sub-caliber bullets.
For those who wish to make commercial quantities of lead wire,
Corbin manufactures the EX-10 lead wire extruder, a dedicated, single-
purpose machine to produce any size or shape of lead wire in 10 pound
spools. The EX-10 uses lead billets of 2-inch diameter, which can be
cast using Corbin's tube moulds. Write for specific information on
this product.
Lead wire for bullet cores can be used in two ways, and the
diameter depends on what way you plan to use it. You can simply swage
the lead into a finished bullet, with no jacket. In that case, the
lead only has to slip easily into the smallest die bore in the set you
are using. Dies made only for lead bullets are at final diameter of
the bullet, and consequently your lead core should be just a little
under bullet diameter.
If the lead is too small in diameter, it will stick out the die
mouth before you have enough of it to make the weight you desire. That
is a situation to avoid -- never apply any pressure to a component that
isn't completely contained within the die. The punch will probably
slip off to one side and be damaged by striking the mouth of the die.
The exact diameter isn't important as long as the core fits into the
die easily and doesn't stick out the die mouth.
But if you want to make a jacketed bullet, then the core has to
fit inside the jacket (obviously!). You cannot start with a .357
caliber lead bullet and somehow "put a jacket on it" to wind up with a
.357 caliber jacketed bullet. Instead, you use lead wire or a cast
core that fits inside the .38 jacket, and expand it upward in the die.
The lead pressure expands the jacket right along with it, resulting in
a tight, uniform assembly.
The walls of a .357 or .38 caliber jacket are usually about .017
inches thick. There is a wall on both sides of the core, and the
jacket normally is made small enough so that it will work for .355
(9mm) as well as .38 caliber. Bullet jackets are almost always
considerably smaller than the final bullet diameter so that they can be
expanded upward from core seating pressure.
This means that you have a jacket with an outside diameter of
about 0.354 inches, minus two walls of 0.017 inches, for a remaining
inside diameter of about 0.320 inches. Better quality jackets have
tapered walls, so that the base is even thicker. In practice, a 0.318
inch core will fit inside most .38/.357 caliber jackets properly.
But for higher precision, a die set for the Corbin presses usually
includes a separate core swage die, which accepts the raw lead core and
reshapes it to a more perfect cylinder, flattens the ends nicely, and
expands the core diameter very slightly in the process. The die also
extrudes a small amount of lead from the core to adjust the weight.
Because of this extra die, it is necessary to use a bit smaller
diameter of core. A 0.312 inch lead core fits nicely into the standard
0.315 to 0.318 inch core swage die, allowing for any bending or denting
that the core might receive in handling. And that is how we arrive at
the proper diameter of lead wire to use for any set of dies, in any
caliber. For jacketed bullets, the core must fit into the jacket and
it must also fit easily into any core swage die that is part of the
set. For lead bullets, the core must at least fit into the final die
and not be so long that it sticks out the die mouth.
In the CM-4 Core Mould, six diameters cover most of the bullets
you might wish to make. The .224 mould makes a core of about 0.185
inch diameter, which works well in the 6mm and .25 as well as the 6.5mm
caliber. The .257 caliber mould crosses over slightly into the .25 and
6.5mm caliber range, but since different jackets have different wall
thickness, it is useful for thinner wall .25 jackets and thicker wall
.270 and 7mm jackets.
The standard 7mm jacket takes a 0.218 inch core, so a 7mm core
mould is made in that size. The .30 calibers all take a 0.250 inch
core, as do most of the .32 and .338 jackets. Heavy walled tubing
jackets in large bores can use the same core size as a standard jacket
might in a smaller caliber. A pair of standard sizes cover the .38 and
the .44-45 calibers. These are 0.312 inch and 0.365 inch,
respectively. A slightly smaller size is made for the .41 caliber and
the .40 Bren 10 caliber.
Using the next smaller size normally serves quite well, without
the expense of having a custom mould built. However, custom moulds CAN
be made to order if desired. For large diameters of lead, Corbin
builds special moulds to order at a correspondingly higher cost than
the CM-4. Moulds for billets of half inch diameter can be used for
shotgun slugs. Tube moulds, which have a steel base with a plug that
slips into the bottom of a honed steel tube, are generally used for
large diameter billets.
Lead cores are discussed in great detail in the book, "REDISCOVER
SWAGING". The advantage of using a lead core mould is the lower cost
of using scrap lead. The advantage of using lead wire is the neatness,
safety, speed, and ease of use. There is not much difference in
potential accuracy. Lead wire has a slight edge over cast cores
because of the great uniformity of the extruded product.
You probably wonder about the hardness of the lead: can you use
wheelweights, or casting alloys to swaging bullets? The answer depends
on the caliber, and the system of swaging you plan to use. In most
reloading press dies, you can't quite generate enough pressure to swage
any lead harder than about Brinnell Hardness 8 (or about 3 percent
antimony/lead alloy) before breaking either the die or the punch. But
in certain circumstances, you can even swage linotype alloys of
Brinnell Hardness 22. The Corbin Hydro-press can swage any alloy of
lead ever made, or even solid copper if you wish.
The reason that you can swage hard alloys in some calibers and not
in others, in some shapes and not others, and in the Hydro-press but
not in a reloading press has less to do with the power of the press
than it does the strength of the dies and punches. If you are curious
about the mathematics involved in engineering dies to withstand certain
pressures, the book "POWER SWAGING" is full of revealing data,
formulae, and charts that will make it all clear.
As a rule of thumb, it's safer to use soft, pure lead for swaging
in all circumstances because pure lead flows more easily at lower
pressures, and thus puts less strain on the dies. But, if you have a
need to swage hard lead for some reason, don't give up just because of
a rule of thumb! We have a way to do it in every case, if you are
willing to purchase the correct kind of tooling. Your stock of casting
alloys can be used if the caliber, die, and press system is selected
with proper specifications for hard lead. Tooling made for hard lead
may, in some circumstances, not be as useful for soft lead because of
the different size bleed holes. That is one reason why you need to
talk to the die-maker before jumping in head first with a bar of hard
alloy in hand!
If you use Hydro-press dies, hard lead is perfectly acceptable
in calibers up to .500 diameter, unless very deep and thin base skirts
or other special designs are planned. The dies are so strong that they
can handle any lead alloy. In the Mity Mite system, hard alloys can be
handled if the die-maker knows in advance you plan to use them. In
calibers above .358 diameter, they are a bit risky because of the die
wall in the smaller Mity Mite series -- an imprudent stroke of the
handle could crack a .45 caliber die used with too hard an alloy. In
the reloading press, calibers of .243 and .224 work reasonably well
with hard lead, but anything larger should be used with alloys of
Brinnell Hardness 6 and under. Corbin supplies pure lead in billets
and in lead wire form, but does not furnish alloy lead except on
special order.
A potential objection to lead wire is the cost of shipping. At
the time of this writing, it costs about $10 to ship a spool of lead
wire completely across the country. A spool of .22 caliber wire makes
over 4,000 .224 bullets. The cost of shipping, then, breaks down to a
mere 0.0025 cents per bullet (that is a quarter of a penny per bullet).
This amount is not prohibitive, and consequently most people choose to
use lead wire for the smaller calibers. In the larger calibers, the
cost per bullet increases since there is more lead consumed in each
bullet, but the trade-off of convenience and safety still results in a
majority of bullet-makers using lead wire.
Corbin has lead billets in 0.795-inch diameter for use in the LED-
1 extruder die (in case you don't care to cast billets), and can
furnish lead in just about any size of billet. Alloys can be furnished
only in minimum lots that generally are 100 to 250 pound, because of
the minimum billet required for a commercial extruder operation. Many
of our customers can provide you with the smaller quantities of alloy
leads: check the "WORLD DIRECTORY of CUSTOM BULLET MAKERS" for
addresses and phone numbers.
.he CHAPTER 3 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
ABOUT BULLET JACKETS
Bullet jackets are the skin of the bullet. They are what makes it
possible to achieve velocities over 4,000 fps and still have no fouling
from melted lead in your barrel. But besides elimination of lead
fouling, the jacket has another important job. It helps control the
terminal performance of the bullet.
Bullet jackets are available from Corbin in packages of 250 or 500
jackets, depending on the caliber and length. Popular calibers are
stocked in certain lengths that are most useful. Not all calibers or
lengths are available directly. Some you have to make yourself, by re-
drawing a more common size. This is done with a Corbin JRD-1 draw die.
Other calibers can be made from copper, brass, or even steel
tubing. A reloading press can only use the commercially available
drawn gilding metal jackets, which range from 0.017 to 0.032 inches in
thickness depending on the length and caliber. The Mity Mite press can
form jackets from 0.030 inch thick copper tubing (hard drawn, straight
tubing, not the soft coiled type). The Mega Mite can handle tubing in
0.030 and sometimes in 0.049, depending on caliber. The Hydro-press
can handle anything, from the thinnest copper to the thickest steel
walls (typically 0.050 steel or 0.065 brass is the heaviest practical
jacket wall, beyond which you may as well swage solid copper rod).
From .30 caliber rifle down, it is both easier and cheaper to use
commercially made jackets and either use them as is, or redraw them for
smaller or longer jackets. Jackets can expand considerably during the
core seating operation, to become larger in diameter. Jackets for
bullet swaging in Corbin equipment are all made several thousandths of
an inch smaller than the final bullet diameter, so you can expand them
upward for a perfect, tight fit on the core.
This is one reason that it isn't feasible to pour hot lead into a
jacket and make a jacketed bullet. The pressure of swaging is needed
to expand the assembly to the right diameter inside a die. Another
reason is that the hot lead would shrink away from the jacket during
cooling, leaving a loose core that would not stabilize in the rifling.
In the calibers from .309 to .338, it is possible to use regular
.30 caliber jackets. Special techniques to expand the jacket evenly
include seating the core in two short sections, so that the base will
form properly. This is done on the .338 and .333 calibers, but isn't
necessary on the .311 and .314 sizes. Using this method, it is even
possible to expand a drawn .22 Magnum fired case into a nice 7mm (.284)
bullet! It works best with a rebated boattail die set and with three
or four short cores seated on top of each other, one at a time.
The best known jacket among bullet-makers is the .22 Long Rifle
case used for a .224 or a .243 caliber jacket. Corbin makes a die set
called the RFJM-22 that turns these rimfire cases into straight-sided
jackets of the proper diameter. Vernon Speer, Harvey Donaldson, and
Fred Huntington were a few of the well-known experimenters who used
this method in the late 1940's. Speer and Huntington both launched
major businesses from this beginning.
The process had flaws in those days, because rimfire cases used
mercuric priming compound. This left the jackets weak and brittle, so
they fouled the bores and often came apart on firing. Today, non-
mercuric priming is used in rimfire cases. The jackets you can make
for yourself not only are as good as any you can buy for most practical
purposes, but they are free!
The disadvantage of making rimfire jackets is that the bullets
have very thin skins -- typically under 0.015 inches -- without the
thick taper toward the base which commercial jackets have. This means
that they are excellent for varmint shooting, because if they hit the
ground they normally blow up and do not cause a ricochet. But they are
not suitable for high velocity (beyond about 3500 fps they blow up in
the air), nor are they suitable for serious game hunting.
You may be surprised to learn that the commercial standard 52
grain bullet has a jacket that matches the length of the drawn .22 Long
Rifle case. This is because the first .224 commercial bullets were
made from such cases! When bullet makers switched to drawn strip
metal, they kept the traditional length. Thus, you do not need to trim
your home-made jackets or make excessive weights of bullets to use
them.
The jacket material is normally either commercial bronze or
gilding metal. These alloys are 10% zinc and 5% zinc, respectively,
with the balance of copper. The zinc is for strength and anti-fouling
characteristics. A rimfire case is about 30% zinc. It is more
brittle, but also less likely to foul the bore at normal speeds. By
annealing the case, you can make it just as ductile as the regular
jacket.
A 6mm (.243-.244) bullet jacket can be made from the fired .22
case (a Stinger or other long case is best). The head is smoothly
drawn off, leaving a diameter of about 0.219 inches at the end. The
body of the fired case is about 0.225 inches in diameter. A special
punch with a flare or bottleneck, like a bottleneck cartridge, is used
inside the case. The jacket becomes slightly longer as it is drawn,
and this lengthening forces the mouth partly over the tapered part of
the punch. It is this tapered mouth that lets you seat a lead core
into the undersized jacket and expand it to full .243 size during the
core seating operation. The flared mouth seals the die against lead
leakage and makes the jacket expand perfectly.
The .22 WMR case takes a different die (a special type of JRD-1
die is used) to make a long 6mm jacket. By careful manipulation of
core weights and seating technique, you can coax this jacket to become
a .257, a 6.5mm, or even a 7mm bullet! This isn't something for the
beginner to try, but once you have mastered the basics, it is fairly
easy to learn.
Bullet jackets have different wall thicknesses, not only between
different calibers and makes, but also within the same jacket.
Commercial jackets have a taper, to control expansion. This means that
when you seat the lead core into the jacket, the core has to be small
enough to fit easily into whatever jacket you are using. If you buy a
set of dies that is made with punches for a certain jacket, and then
change to another jacket (such as going from a commercial drawn jacket
to a copper tubing jacket), you will probably need to obtain a
different core seating punch.
The core seating punch fits inside the jacket, rather than the die
itself, whenever you want bullets with the lead seated down past the
jacket mouth. (Bullets with large lead tips, such as semi-wadcutters
and lead round nose bullets, are made using a core seating punch that
fits and seals pressure against the die wall instead of inside the
jacket.) If you change from a 0.020 inch wall jacket to one with walls
of 0.050 inch thickness, then you need a punch that is considerably
smaller in diameter to fit the new jacket. When you order dies, either
let Corbin supply the right jacket to fit them, or send a sample of the
jacket you want to use. If you want more than one jacket, remember
that you may need more than one core seating punch.
The other part that you may need for different jackets is the core
swage die. Core swage dies make the core the right size and weight,
starting with an undersized piece of lead. Reloading press dies don't
use a core swage for technical reasons. Special swage presses almost
always use die sets that can have a core swage as the first die of the
set. When you order a set of dies for jacketed bullets, the diameter
of the core swage die is important to the diemakers. The core that is
produced must be small enough to fit inside whatever jacket you are
going to use. If you later add copper tubing, or change to a thicker
wall jacket (such as drawing down a larger caliber to get a longer
jacket for a heavier bullet), it may require another core swage die of
smaller diameter.
The right size of lead wire or core mould for a certain caliber
depends on the jacket you plan to use. Most standard jackets that are
available from Corbin take standard, off-the-shelf diameters of lead
wire and core moulds. If you furnish your own jackets, you may need to
send samples to get a special size made to order. Core size for the
jacket is not terribly critical: as long as the core fits and the
weight is about right without being so long that the core sticks out
the die mouth, you can use any size.
One exception is that your core shouldn't normally be a press fit
into the jacket, so that it traps air in the bottom. The short, thick
half jackets for .38 caliber sometimes fit a bit snugly on the standard
core, but they don't cause any problem. It is the long, tapered
jackets of larger caliber handguns and of rifle bullets that create a
potential problem with too snug a core.
The problem arises when the core fits so tightly that air is
pushed into a highly compressed disk at the bottom of the jacket. If
the bullet is finished with the jacket brought around the nose or
ogive section, you don't notice any problem. Accuracy is usually good
because the air is normally quite highly compressed and centered rather
well. But if you make a semi-wadcutter style bullet (and by that, we
in the bullet-swaging field refer to ANY style of nose, be it round or
flat, hollow or pointed, so long as the nose is entirely made of lead
projecting from the jacket, and the jacket is NOT curved at all to lock
the core in place), then the trapped air can expand when the bullets
are brought into the hot sun. Sometimes, the cores will pop out with a
loud bang and jump harmlessly across the room!
The answer is to use a core that slips to the bottom of the jacket
without force. Or, if you want to use a core swage die that is nearly
but not exactly right, you might want to have the die-maker machine a
special internal punch with a cavity in the shape of a boattail or
Keith nose in its end. The cavity would form a mirror image of itself
in the lead core, so that a section of the core would then fit nicely
into the bottom of your tapered wall jacket without trapping any air.
This technique lets you use the same core swage die with several
calibers and with several different styles of jacket in the same
caliber.
The right core mould for heavy wall tubing jackets is much smaller
in diameter than the right core mould for a standard drawn commercial
jacket. In fact, the next smaller caliber of mould is normally used.
For instance, a .30 caliber core mould might be used with a tubing
jacket bullet in .358 caliber, whereas a .38 caliber mould would be
used if you were to make commercial jacket bullets with those same
dies. When you order, we supply the size of equipment needed for
standard popular jackets that we stock unless you specify otherwise, or
unless we know that tubing jackets are going to be used.
Bullet jackets can make a wide range of weights even with the same
length. The exact weight range for any given caliber and length of
jacket depends on the ogive shape and base shape, as well as the degree
of hollow point or hollow base and the lead density used, and the
thickness of the jacket. There is no single "right" weight for a given
jacket because of all these variables. But that means you, as the
bullet-maker, can manipulate the variables and produce all kinds of
different weights using a limited stock of jackets.
For instance, in the .44 caliber, a 0.54-inch long drawn jacket is
very popular with shooters who have 3-die sets, such as the FJFB-3
type, to make bullets with the jacket curved around the ogive. By
adjusting the amount of lead used in the jacket, you can make any
weight from 180 to 250 grains with this jacket. The lighter weights
have open points, and the heavier weights have more and more lead
exposed at the tip.
The bullet-maker who uses a semi-wadcutter die limits himself
somewhat on the range of weights possible with a given jacket, since he
cannot take up any jacket length by curving jacket material around the
nose. He can, however, change the amount of nose by selecting
different punches, or change the amount of lead used by selecting
hollow point or cup base punches and adjusting how far he presses these
into the die. Then, he can follow with the regular Keith or other
semi-wadcutter type of punch to shape the lead that is moved forward by
the hollow point punch.
This technique lets the bullet-maker adjust weight even on semi-
wadcutter style bullets with the same jacket length and still have the
same amount of lead showing! A technique not widely known is the use
of ordinary cornstarch as a filler in the base of the jacket. By
placing cornstarch in the bottom of the jacket and seating a lead core
over it, you can produce very high velocity, light weight bullets in
jackets that everyone else thinks only make heavy weight slugs.
In the .25 ACP caliber, you can make jackets from fired shotgun
primers using the SPJM-25 die set. This kit lets you push out the
anvil and cap, and draw the top hat battery cup into a smooth-sided
jacket for a 45-50 grain .25 caliber bullet. Jackets for sub-calibers,
such as the .14, .17, and .20 caliber, can be made from ordinary .224
commercial jackets using three drawing dies. The jackets need to be
annealed by heating to a dull red briefly, so that the bottoms won't
crack out when you draw them to .14 caliber.
Dies that use larger caliber jackets, such as the sub-caliber draw
dies, can be made with a pinch trim punch so that surplus material is
pinched off as the jacket is drawn. In order to pinch trim a jacket,
there must be a reasonable amount of reduction taking place. It is
difficult to pinch trim a .38 jacket being drawn to .350, for instance,
because most .38 jackets begin at .3545 diameter. That doesn't leave
enough difference for a pinch trim punch to work. But drawing from a
.308 to a 7mm, or from a 7mm to a 6.5mm, leaves plenty of metal for
pinch trimming to any desired length.
You don't have to use a jacket. Many handloaders don't yet
realize that bullet swage dies can be used with or without jackets, and
that a swaged lead bullet can be made faster, more precisely, and with
far greater control of weight and style than a cast bullet. The same
dies can be used for jacketed bullets or lead bullets. (This doesn't
necessarily work in reverse: if you buy a LSWC-1 lead semi-wadcutter
die, designed just to make lead bullets, it won't make fully jacketed
bullets because the bleed holes in the side of this die would then be
covered by the jacket.)
Lubrication on a swaged, smooth-sided bullet is accomplished by
changing from Corbin Swage Lube to Corbin Dip Lube. Dip Lube is a
liquid wax that is applied to the core before swaging a lead bullet.
The pressure of swaging forms a hard, tough film of wax all over the
bullet. The wax doesn't melt or affect the powder like bullet greases
do. Since it covers the whole bullet, no lead is exposed to the air or
to the bore without having some lube between the bore and the lead.
Naturally, this "liquid jacket", as some people call it, doesn't
stand up to the torque and heat of high velocity firing like a regular
jacket would. It does serve well for most shooters using loads up to
1,200 fps, and cuts the cost of shooting by eliminating the jacket as
well as speeding up the whole bullet-making process. Corbin Dip Lube
is available in pint cans or gallons. A sample 2-oz. bottle is
available as well.
Re-forming jacketed, factory or military surplus bullets in a
standard swage die (the point forming die, usually) is also possible.
There are some cautions and limitations. The bullet must be smaller
than the final diameter desired, because you cannot expect a .308
bullet to fit easily into a .308 diameter hole and eject easily after
reforming. It should be a 0.3085 to 0.3090 inch die in order to use a
.3080 inch diameter bullet for reforming. Also, there are some minor
problems with lead coming forward out the nose of a finished bullet
when you change the ogive shape to reduce the total internal volume.
But, on the other hand, we have made hundreds of single-die swages
that turned rather inaccurate military surplus bullets into soft points
of very good accuracy simply by swaging them backward, so the base
became the nose and the pointed nose became a solid base! And in other
cases, we have made 5.56 and 7.62 mm bullets shoot twice as well by
simply bumping them up half a thousandth of an inch while making their
open bases more perfect and even. These transformations are quick and
easy when they can be made to work with a standard die. I would not
recommend putting a lot of money into tooling specially built for it
unless you have a tremendous number of surplus bullets to reform.
Bullet jackets can be made that have partitions, variations in
thickness (selective heavier base sections), completely closed bases,
solid copper bases, and multiple jackets stacked inside each other.
Most of the heavy duty jacket making, using copper or brass tubing and
such styles as the partition or H-mantle, are done on the Corbin Hydro-
press. Hand presses and dies made for them do not have the ability to
produce or withstand the extreme pressures used. Within a more limited
range, however, you can still make exotic jacket designs by using the
telescoping jacket idea: putting smaller calibers inside of larger
ones is a very effective way to control performance.
A thorough discussion of bullet jackets can be found in the book
"REDISCOVER SWAGING", and the various technical bulletins published by
Corbin Manufacturing have further details on making tubing bullet
jackets, rimfire cases into jackets, and even the use of fired brass
cases as bullet jackets.
.he CHAPTER 4 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
SWAGING IN THE RELOADING PRESS
If your reloading press accepts standard 7/8-14 TPI dies and its
ram will take regular RCBS button-type shell holders, then you can use
it for swaging certain calibers and kinds of bullets with Corbin
reloading press swage dies. A heavy-duty press makes the work easier,
but any modern press capable of resizing a .30-06 case is strong enough
for bullet swaging in the styles and calibers we offer.
There are limits to the pressure you can safely apply to the soft
screw-stock rams used in nearly all current reloading presses. The
size of the frame or leverage of the press has nothing to do with this.
A massive press like the RCBS Big Max still has a four-inch stroke, to
get a magnum rifle case in and out. Small arms bullets, on the other
hand, need only about two inches of stroke in order to be successfully
swaged. This wastes half the leverage in a reloading press.
Single station, ram-type presses are the only kind currently
supported by swaging equipment. Presses with turrets, rotating shell
holder plates, aluminum frames, mechanical type shell holders that
adjust to different size cartridge heads, progressive loaders, and bar-
type rams used in H-frame presses all have features that make some
swaging operations difficult or impossible. Standard swage dies for
reloading presses do not require a massive press, but they do work best
in a simple, single-station conventional round-ram press.
A special swaging press like the Corbin Mity Mite (CSP-1) or a
combination reloading and swaging press like the Corbin Mega Mite (CSP-
2) has the capability to more than double the leverage in a reloading
press design. It does this by cutting the stroke in half. The same
effort that moves a reloading press ram four inches is now put to work
moving the ram only two inches. The effort is converted into higher
pressure within the die.
Such presses have many special features designed to allow higher
stresses, equalize the torque on the ram, align the die and punch more
precisely, and provide for automatic ejection of the bullet on the back
stroke. The die can be designed to withstand higher pressure, since it
doesn't have to fit into the constraint of a standard reloading press
dimension.
In these presses, any caliber from .14 to .458 rifle bullets with
tubing jackets as thick as 30 thousandths of an inch are perfectly
feasible. In a conventional reloading press, you are limited to the
.224, .243, and .257 rifle calibers, and the .25 ACP, .30-32 Handgun
and carbine (130 grains or less, no spitzer rifle shapes), 9mm and
.357/.38 Handgun calibers. Within those calibers, there is
considerable latitude for weight and style variation.
Regardless of the press or system, you can make lead bullets or
gas-checked bullets in any die capable of jacketed bullet swaging. And,
you can use longer or shorter jackets in the same set of dies. There
are some dies made just for lead bullets, combining the steps of core
swaging and core seating so that you can make a lead bullet in one
quick stroke, and these special (model LSWC-1) dies are not generally
suited for use with more than a half-jacket. These dies are not made
for the reloading press, in any case, since they require bleed holes in
the die wall.
Core swage dies and other lead-forming dies that have extrusion
holes through their walls to let you automatically adjust the lead core
weight on each stroke (instead of just using whatever weight of core
you happen to put into the die) need room around the side of the die
for the lead to come out. In a reloading press, the die is put into
the head of the press. Because of the length and top position of the
ram in a reloading press, the die has to be located so its walls are
surrounded by the threads of the press. This doesn't leave room for
correctly located bleed holes.
In order to do it right, core swaging and lead semi-wadcutter dies
that adjust the core as they form the bullet are made only for the
special swaging presses, and not for use in reloading presses. You can
still make lead bullets of equal quality in a reloading press, but to
get there, you must be more careful about how you cut or cast the
cores. What you put into the die is what you get out, in regard to
weight control. This is a major advantage of the special swaging press
systems, and is one of the things that makes it difficult to "convert"
or adapt many of the advanced kinds of dies for use in ordinary
reloading presses.
Reloading press swage dies are made with a UNIVERSAL ADAPTER BODY,
which is the same for all styles and calibers of dies. This component
holds the actual die "insert" and internal punch together in the proper
relationship, and fits into the 7/8-14 TPI threads of your
reloading press. All adjustment for different weights and styles of
bullets is made by turning the whole die, universal adapter and all, up
and down in the threads of the press like a big micrometer thimble.
There are two punches in every swage die. The INTERNAL PUNCH
stays inside the die. It is held there by two restraints: the punch
has a head on the top that won't let it fall through the die on the
"downstroke", or ejection cycle, and the universal adapter body only
lets the punch head slide up a certain distance before it strikes the
top of the hole machined in the adapter. The EXTERNAL PUNCH fits into
the slot in the press ram, just like a shell holder. It can easily be
removed and changed. Most people own several external punches for each
of their die sets.
A small hole goes all the way through the top of the adapter. It
is .257 inches in diameter, and takes a quarter-inch diameter KNOCK-OUT
ROD (also called the ejector rod or simply K.O. rod). The Knock-Out
rod is long enough so that it can push the internal punch down nearly
the same distance as the die is long. That pushes the bullet out the
die mouth. On one end of the Knock-Out rod is a knurled head, big
enough to give you a good target to tap with a plastic mallet or a
piece of wood. This drives the bullet back out of the die after
swaging.
The ejector rod comes completely out of the die, so you can use it
on any of your reloadin press swage dies. Another way to eject bullets
-- one with a little more sophistocation -- is to slip a Corbin POWER
EJECTOR UNIT over the top of the die and fasten the three set-screws
into the ring machined around each of the universal adapter bodies,
right below the knurled part.
The power ejector is an optional accessory item. It speeds up the
operation by eliminating the need to pick up a mallet and tap the
ejector. Instead of using the regular ejector, you install a straight
piece of quarter-inch diameter steel rod, supplied with the PE-1
ejector. Following the instructions that come with this tool, adjust
its ram so that all the free play is taken up when you have a bullet in
the die, ready to be ejected. From this point on, your swaging
operation is reduced to two levers: the press handle swages the
bullet, and the power ejector handle gently but firmly pushes it out of
the die.
The internal punch in your reloading press swage die can be
removed easily. Identify the die insert itself. This is the super-
hard high-carbide alloy steel cylinder at the very bottom of the whole
die assembly, just protruding from the adapter about a quarter inch.
Most of the die insert is up inside the adapter body, which is machined
to accept the 5/8-24 TPI threads on the other end of the die. To
remove the die, grasp the small protruding surface with pair of pliers
and unscrew it. (Don't worry about marring the die -- it is so much
harder and tougher than your pliers that you can't hurt it this way.
On the other hand, don't grasp the oxide-blued adapter body with
pliers: it isn't very hard, and you can damage the threads. Just hold
it in your hand.)
There are basically three dies available for the reloading press
that are swage dies, and several kinds of draw dies. The swage dies
are:
(1) The CORE SEATER
(2) The POINT FORMER
(3) The LEAD TIP DIE
The core seater (CS-1-R designation, in the reloading press
system) can perform two different jobs. It can be used by itself to
make any kind of bullet that has straight, parallel sides, a small
shoulder, and a lead nose from the shoulder up. The whole bullet can
be lead, or any amount of it can be covered by a jacket right up to
that shoulder. Think of a Keith handgun bullet with a jacket coming
right up to the semi-wadcutter shoulder and then stopping. Right up to
this point, the bullet is straight. The jacket can't be curved past
this point in this kind of die alone.
However, the nose can be any shape you like. The nose is formed
by letting the lead core flow down into a cavity machined in the end of
the external punch. You can make a round nose, a Keith nose, a
wadcutter (very little cavity, if any, in the external punch tip!), a
conical nose like a pencil point, or anything else including fancy
multi-cavity hollow points (instead of just a cavity, there is also a
probe or rod in the end of the punch to make these). The point is,
while you can just change the punch to whatever the lead core flow down into a cavity machined in the end of
the external punch. You can make a round nose, a Keith nose, a
wadcutter (very little cavity, if any, in the external punch tip!), a
conical nose like a pencil point, or anything else including fancy
multi-cavity hollow points (instead of just a cavity, there is also a
probe or rod in the end of the punch to make these). The point is,
while you can just change the punch to whatever thickness to its edge,
or it would quickly crumble away. A 0.015 to 0.025 edge thickness is
standard. This small edge comes up against the jacket in our example,
and presses hard on the thin jacket material. One of them has to
buckle and fold. Usually it is the jacket.
If you try to make a semi-wadcutter bullet, and the jacket comes
out with radial folds, much as if someone sat on your top hat, then see
if you have enough lead sticking out the jacket to completely fill up
the cavity in the punch you selected. If not, that's the problem, and
the solution is to use a heavier core, a shorter jacket, or a punch
with less of a cavity. Another solution is to use a hollow point punch
first, moving lead up and out of the jacket, and then form your nose
using the extra amount of lead displaced from inside the jacket.
Let's back up a minute in case anyone is lost at this point. We
are talking about the most basic kind of swage die, the core seating
die. It is called a core seating die because it can be used to seat or
press the core down into a jacket, expanding the core and the jacket
together until they contact the walls of the die. The internal
pressure becomes uniform as soon as the jacket is pushed out against
the die walls evenly, and the base of the jacket comes hard against the
internal punch face. This uniform internal pressure can exceed 20,000
psi (and usually does).
Compressed oxygen gas in a welding tank is in the 2,000 to 3,000
psi range. Compressed air in your car tires is usually 35 to 45 psi.
When you fire a typical rifle, pressures momentarily peak at levels
that reach 25,000 to 55,000 psi typically. The average pressure over a
second of time is vastly lower. The swage die must be able to sustain
anywhere from 20,000 to 50,000 psi constantly, year after year, without
change in its diameter, roundness, straightness. It can't develop a
barrel shape inside, nor can it grow with the continued stress.
Tolerances in a casting mould usually are held to 0.003 to 0.001
inches, plus or minus. Tolerances in the core seating die are usually
held to better than 0.00005 inches, plus or minus! Your bullet doesn't
need to be within that tolerance of some arbitrary standard diameter,
of course, but it is nice to know that whatever diameter it comes out,
it is repeatable to such high precision. The typical absolute diameter
tolerance on the bullet diameter is normally 0.0005 inches plus or
minus, although this has long been proven of little importance, as long
as the variance is held to high precision tolerances.
In other words, if you have a .308 rifle, and you know for sure
that your barrel has a .3000 bore, with all grooves at exactly 0.0040
inch depth, it still doesn't matter nearly as much whether you shoot a
.3079 bullet or a .3090 bullet down that barrel, compared to whether
your bullets vary from one to the next as you try to put them into one
hole. Many competitive shooters find a bullet with nearly 0.001 inch
larger than nominal diameter shoots better at long range than a
conventional "correct" diameter bullet.
In any case, the core seating die is a straight hole die. If you
take it out of the adapter body and pull out the internal punch, you
will be able to see straight through it. The hole is round, straight,
and highly finished. The internal punch is a very close sliding fit.
The external punch can fit the die bore, for making those semi-
wadcutter and wadcutter type bullets, or it can fit inside the jacket
for making rifle-style bullets.
Let me make a definition of these two general kinds of bullets.
It's important to understand what I'm talking about so you can make
proper and cost-effective decisions later on. There are semi-wadcutter
styles, and rifle styles of bullets, relative to the kind of equipment
needed. When a swage die-maker talks about a semi-wadcutter (or
wadcutter) style, it isn't just a specific nose shape. In regard to
the kind of equipment required, it means any bullet that is made with a
lead nose, ending at a small shoulder, and having the jacket at full
bore diameter all the way to the base (if there is any jacket).
This kind of bullet can be made in a single core seating die in
one stroke of the press. One pass -- all done. No lubricating, no
sizing. Just load it and enjoy shooting it. Lead bullets are swaged
with a film of flexible, hard wax bonded to them under swaging
pressure. This is accomplished by dipping the core in a liquid "Dip
Lube", which some people call "liquid jacket", just prior to swaging.
The film evenly covers the bullet, making it usable to speeds of 1,200
fps with no grooves, no separate lubricating steps.
Cup bases? Hollow bases? No problem -- just remove that flat
ended internal punch, and install an optional internal punch with a
probe shaped like the cavity you want to form. Both the nose and base
are formed at the same time, by pressing against the two punches.
Unlke a mould, there is no conflict between hollow bases and hollow
points. They are independent of each other and can be mixed or matched
any way you like. In fact, you can turn the swaged bullet over and
swage it the other direction, perhaps using a little higher setting of
the die to get slightly less penetration of the punch. This gives you
shapes that neither of the punches has by itself, and demonstrates one
of the more powerful experimental features of swaging equipment.
We mentioned seating the core inside the jacket. If you wanted
to, you could select an external punch (the one that slips into the
slotted ram like a shell holder) with a small enough diameter to fit
right inside the jacket. Jackets usually have some taper in the wall
thickness to control expansion. The punch will contact the jacket wall
at some point if it is a close fit. Obviously there are some limits as
to the depth of insertion of any given diameter punch, and to the range
of weights of cores that you could seat with each punch.
If the punch is too small, lead will spurt out around it and you
may not be able to build enough pressure inside the jacket to expand it
properly. This produces undersized and tapered bullets. If the punch
is too large, it may not go into the jacket at all, or it may plow up
jacket material as it presses down. This isn't always bad -- it can be
used to thin the front of the jacket, or to help lock the core into
place. Usually, though, the jacket and punch need to be made for each
other to avoid this. Fortunately, Corbin is the world's largest
supplier of bullet jackets of all types, and can provide the right
punches for any jacket or core weight, as well as the jackets to match.
The reason for seating a core inside the jacket is to make that
second kind of bullet, the rifle-style bullet having the jacket curved
around the ogive, with an open tip. Let's define open tip and hollow
point for bullet swagers. An open tip bullet has the core seated below
the end of the jacket. The jacket extends forward, past the core.
This leaves an opening or an area devoid of lead just below the tip. A
hollow point, on the other hand, is made by pressing a punch with a
projection or probe machined on the end into the core. The hole or
cavity thus formed in the core is further shaped when the ogive is
made. The result is a bullet with a hollow area in the point, formed
in the lead itself.
A hollow point bullet can have a lead tip, or it can have the core
seated down inside the jacket. Usually, it has a lead tip exposed
beyond the end of the jacket. But an open tip bullet can't, by
definition, have a lead tip. The reason to be clear about these terms
is so that when you order tools and punches, everyone will be talking
about the same thing. It makes a big difference whether you can make
what you want once you get the tools. A hollow point is made with an
optional punch, during the core seating stage. An open tip is made by
using a punch that pushes the core down inside the jacket. It is the
standard, "default" design for any regular set of dies that includes
more than a core swage and core seating die. And a lead tip bullet
takes a lead tip forming die in rifle styles, but seldom requires
anything special in the blunt, wide-tip handgun styles.
To make that second kind of bullet, the rifle-style bullet, you
still need the straight-walled core seater. The uniform pressure that
this die produces is necessary to expand the jacket to correct
diameter, mate the core and jacket perfectly, and produce the straight
and round tolerances in the jacket. But with the core seated down
inside the jacket, all you have now is a very accurately formed
cylinder!
To put the ogive (that's OH-JIVE, by the way, like "Oh, don't
gimme no jive, man!") on the bullet, we'll use the second kind of swage
die, the point forming die (designated PF-1-R for reloading press
dies). Now, the term "point" is often confused with the term "tip".
Again, it's nice to talk the same language when ordering parts over the
phone. A point on a bullet refers to anything past the shank or
straight part. A point is the same thing as a nose. The tip, on the
other hand, is just the very end of the point. It is the part that
ends, technically, after the meplat, and begins at some arbitrary place
on the ogive curve that is close enough to the meplat so that it can
have a different curve and not affect the over-all bullet outline
significantly.
Simply put, the tip is the very end of the bullet's nose. The
point is everything from the tip to the start of the straight part
(shank) and the point is the same thing as the nose. To add confusion,
some people even call the point the ogive, so really the terms point,
ogive, and nose all refer to the same thing in general sales talk. But
tip is different.
The ogive is formed by pushing the straight cylinder you made in
the core seating die into the point forming die. It goes in nose
first. If you want the nose to be made on the open end of the jacket,
then the open end goes in first. You can make a solid nose, or full
metal jacket (FMJ, as it is called, though strictly speaking, the open
tip also is a full metal jacket bullet) design by pushing the seated
core and jacket into the point forming die base first. Special notes
on this technique can be found in Corbin technical papers and books.
The point forming die has the actual shape of your bullet frozen
in tough die steel, diamond lapped to extremely fine finish and
tolerance by skilled die-makers. It is a hand-made die, produced by
craftsmen with years of experience. It isn't much like a punch press
die or a plastic moulding die, and people who have skills in those
fields usually can't produce good point forming dies without a great
deal more training.
To make this die, both reamers and laps have to be cut to
precisely the right shape and diameter for your desired bullet. In
reloading press equipment, the great attraction is the lower cost since
you can use an existing press. If your main goal is economy, then it
doesn't help that goal to increase the cost of the dies by adding extra
labor, so we manufacture only standard shapes and offer no custom work
in the reloading press line. By doing this, we have been able to
produce swage dies superior to those costing ten times as much, that
are made to special order. Corbin makes the only serious attempt at
mass production of hand-crafted swage dies: by eliminating all the
stages of custom fitting and tooling, we've been able to bring swaging
equipment of high quality to every corner of the earth, and introduce
thousands of people to swaging who could not otherwise afford to try
it.
If you want custom shapes and diameter, on the other hand, then we
do have another system set up to handle it at reasonable cost. In
fact, this system is designed on two levels: semi-custom and fully
custom work using the same basic equipment. The advantage is that we
can use all standard blanks, that fit into standard presses and use the
same general parts. Your cost is lower, your replacements or repairs
are much simpler, and the whole system is so well proven it has become
the world's defacto standard for swaging. It's called the Mity Mite
system, and we'll discuss it shortly. Semi-custom outfits can be
obtained by selecting from the wide variety of off-the-shelf components
kept in moderate supply for immediate delivery. Fully custom outfits
can be produced, subject to the usual waiting list.
In the reloading press, the point forming die is built very much
like the core seating die. It fits the same universal adapter body, so
both dies look almost identical from the outside. The difference is
easy to tell: push on the ejector rod. The core seating die has no
internal spring. The ejector rod will slide the internal punch down
and you'll see it at the mouth of the die. The point forming die has a
small (0.080") spring-steel wire pin passing through the tip of the
cavity. This pin is a press fit into a steel button "head". The head
is machined to go into one end of a coil spring.
The spring presses between the top of the die and the head of the
ejection pin. We call the internal punch an ejection pin. The heavy
rod that pushes on it is called the ejection rod, you'll recall. If
you order a new ejection rod, you'll get this quarter-inch diameter rod
with the knurled head. If you order a new ejection pin, we'll want to
know the diameter of wire, or at least what caliber of die it fits.
The reason for having a spring in this die is to hold the pin out
of the main part of the die cavity during bullet swaging. The only
purpose of the ejection pin is to push the bullet out of the die by its
nose. If the pin were down in the cavity, the bullet would form up
around the pin, and then it would be stuck in the bullet. This is
exactly what happens if you forget to use lubricant. Now it's time to
mention a very important part of swaging: the correct lube.
For lead bullets, you have seen that a wax solution called Dip
Lube can be applied before swaging the core. For jacketed bullets, a
different kind of lube, serving a totally different purpose, is
required. Swage lube is made to stand up to extreme pressures without
losing its protective film -- a barrier between the smoothly finished
die wall and the moving jacket material. Ordinary case lubes are
useless. Don't try them. Swage lube is a little more expensive, but
it goes a long way and it works. Your dies will last virtually forever
if you use the right lube and clean materials.
Every component needs a thin film of lube applied before it goes
into the die. Lead or jacket, there must be a film of lube between it
protective film -- a barrier between the smoothly finished
die wall and the moving jacket material. Ordinary case lubes are
useless. Don't try them. Swage lube is a little more expensive, but
it goes a long way and it works. Your dies will last virtually forever
if you use the right lube and clean materials.
Every component needs a thin film of lube applied before it goes
into the die. Lead or jacket, there must be a film of lube between it
You simply press
the seated core in (using proper lube), and eject the final bullet out.
The bullet goes in nose first, pressed in with an external punch that
is as big as the bullet base. It comes out base first, pressed out by
a tiny ejection pin that bears on the tip of the bullet. The reason
you cannot form the complete bullet in one stroke in this die is that
the pressure required to expand the jacket uniformly is not present in
this kind of die. There are two exceptions. You can make a full metal
jacket bullet in this die alone. And you can make a lead bullet.
The techniques for FMJ styles are discussed in other books. Lead
bullets are simply a matter of shoving the lead into the die. It has
to be smaller than the die cavity, naturally. Everything about swaging
assumes you know better than to push a larger component into a smaller
die cavity. The match between core seating die and point forming die
is very good. For many years, bullet makers thought that it was
necessary and desirable to have a slight pressure ring at the bottom of
the bullet. This "pressure ring", as it was called, was promoted as
increasing accuracy by many die-makers of the 1950's. It may not hurt
accuracy at all, and it could help in some cases.
In reality, though, the story is a little different. Most die-
makers of the past worked at home or in very small shops, and didn't
have the money for really expensive, high-precision instruments to
measure the bore sizes of the dies as they were being produced. As a
result, a match of 0.002 to 0.0008 inches between core seat and point
form die cavities was about all the die-makers could manage. Even
today, that is typical of the best amateur work and is seen in some of
the higher priced benchrest dies as well.
Because of this difference, the seated core and jacket always went
into the point forming die considerably under final diameter. The
pressure of swaging the point expanded the jacket slightly, but most of
the expansion took place at the base. These bullets won a lot of
matches, but they still had a bit of taper and a bulge at the base.
The die-makers, not knowing how to get rid of it, and noticing that
even with this defect, the bullets still outshot most factory slugs,
started hinting that maybe this was really a design feature put in by
plan, instead of something they hadn't yet acquired the tools to
eliminate.
Today, we still run into a number of precision shooters who read
the old literature and come to believe that a "pressure ring" is
necessary for good shooting. I don't think that having a 0.001-inch
larger base is harmful to accuracy, but I don't think it necessarily
does anything valuable. On the other hand, a bullet that is up to
0.001-inch larger than standard size, and straight, is probably going
to be a good shooter and it won't expand the case neck as it is seated,
then leave the case somewhat loose on the forward part of the bullet.
With much taper on the bullet, the act of feeding the round can push
the bullet back into the powder, and I know that won't help accuracy.
We can make bullets tapered, straight, or with a pressure ring.
In the reloading press, we don't offer a choice. In general, it is one
of those features that is best left to the die-maker, since
specification of too many "nit-picking" details only runs up your cost
for special charges on the die-maker's labor, and doesn't give you any
more accurate bullet one way or the other. But, if you need something
very special in this regard, it is one more thing that has been pinned
down and can be offered to anyone who feels it is worth the extra
expense.
The core seating die has made us some semi-wadcutters and seated
some cores for rifle-style bullets (I say rifle style because they
could just as well be .32 handgun bullets or .243 rifle bullets -- it
is exactly the same process, same kind of die, and the only difference
is the size of the hole and the size of the components going into it).
We have used the point forming die to shape the rifle-style bullet by
forming the ogive, and in two steps we have made nice open tip bullets.
What about lead tips and hollow points? The hollow point is made
by seating the core with a hollow point punch, then forming the ogive.
If the hollow point is also a lead tip, then the lead is longer than
the jacket. Trying to eject this bullet may cause some deformation of
the tip, since the ejection pin has to push on the tip with some force.
The third die we mentioned (lead tip die) is made to finish off the tip
so it looks as good as or better than factory bullets.
The lead tip die (designated LT-1-R for the reloading press) is
much like the core seating die, except that it has a slightly larger
bore size, and the internal punch has a cavity that matches the ogive
in the point form die. The deformed lead tip fits up inside this
cavity. Applying gentle pressure reshapes the lead tip, shears off any
surplus lead, and leaves a fine looking lead tip that can be flat,
sharp, or radiused. The lead tip die is a nice addition to any set,
giving you the ability to reform the tips and even to close the open
tip more tightly than you can do it in the point forming die alone.
The smallest tip opening is the same diameter as the ejection pin
in the point form die. This ejection pin has to be strong enough to
push the bullet out of your die, or you will be constantly replacing
the ejection pins and having stuck bullets. So, a diameter of about
0.080-inch is used in reloading press sets. This is a good compromise
between design strenght and appearance. You can close the tip even
further by using the lead tip die carefully. This takes a little
practice to avoid pressing a little shoulder in the ogive, but once you
figure it out, it is easily repeated.
How do you know how hard to push on the handle? Just push a
little bit, very lightly. See if the jacket and core remain in the
core seating die, or if they come back with the punch. Normally, the
correct pressure just expands the jacket enough so that it stays up in
the die. In point forming, use just enough pressure to form the bullet
until you start to get a parallel pipe of jacket or lead on the tip
(pushing the bullet material up into the ejection pin hole). That is as
far as you can expect to go. Back off slightly on the die adjustment
by raising it higher a half turn or so in the press, and you can then
use the full ram stroke to set your insertion depth each time.
One key to uniform swaging in the reloading press is to use the
top of the stroke, so that each time you move the press handle, you are
using the physical limit of the press to control how far the punch
inserts into the die. This controls amount of hollow cavity, the degree
to which you reshape a bullet, the amount of tip closure on your ogive,
and whether or not you are going to get a good lead tip. Everything
depends on uniform stroke, uniform insertion of the punch. And that is
most easily set by raising the die, so that the ram goes as far up as
it can. Then lower the die, to obtain the desired shape or insertion.
The right pressure should be about like sizing a case. The larger
the caliber, the more pressure you will feel on the handle. In no case
is it necessary to throw your weight on the handle, or break your
loading bench, or use a cheater bar. Doing these things will quickly
make the die-makers more wealthy, because you will soon break your die
and mash your punches into pancakes, requiring that you replace them.
If you feel generous toward die-makers this week, by all means jump up
and down on the press handle a few times. Otherwise, a mild one-hand
force is quite enough.
Another point in regard to destruction of parts: always try a
punch by hand first. If it won't fit, wipe it off several times with a
clean cloth, oil it lightly, and try again. If it still won't fit,
make sure that you have the right punch! Punches must fit closely but
with relative ease into the dies. Keith nose punches, and others with
deep cavities, expand slightly and may not fit easily by hand after
they have been used. But they do fit, given a little oil and a little
gentle pressure. I have seen .242-inch diameter rifle punches (for the
6mm point forming die) pushed into a .2238-inch diameter hole in the
.22 core seating die. "I thought it went in a little hard," the
bullet-maker said. Yes, I guess it might. Comes out a little hard,
too. Try it by hand first.
The slot in the reloading press ram collects primer residue and
metal shavings. Take a cotton swab or a wood pick and scrape it out
before installing your bullet swage punch. The material stuck in the
slot can tip the punch, causing it to ram into the die at an angle and
tear a nasty gouge all down the side of the punch. Again, be gentle
when you first start out. Don't use speed or force on the first
stroke, but instead, gently guide things together and notice how they
fit. Then go after it, once you know everything is lined up.
Making .22 caliber bullets out of rimfire cases is one of the most
popular swaging activities today for a reloading press bullet-maker.
It has been so for twenty years. The process takes three steps. Draw
the jackets, seat the cores, and form the points. Lead tip bullets add
a further step of forming the tips. Detailed instructions come with
the die sets, and further information is found in the various technical
bulletins and text books we publish.
The photos in this book will give you a good idea of how the
process works. The most questions are about annealing and cleaning .22
cases. First, annealing is usually done after boiling in hot soapy
water and vinegar (to clean and shine the brass). Annealing is only so
that the ogive will form without any folding. If you make a big lead
tip, you probably can avoid annealing. There are several ways to go
about it. Putting a group of clean cases in a tuna can, inside a lead
pot, and letting them turn dark brown (15 minutes, usually) will do it.
Using a toaster oven on high, or putting a pan of cases in a self-
cleaning oven for the duration of the self-clean cycle is also good.
Using a propane torch or electric heat gun (Corbin FHG-1) is also good,
primarily for smaller lots.
The older books suggested 600 to 650 degrees F. I have found that
modern cases take 800 to 900 degrees F., and that a standard electric
oven doesn't usually get hot enough. We do make excellent quality heat
treatment furnaces, but for the hobbyist they are too expensive. The
time and quench after heating are not critical. Quenching has no
effect on the hardness. It merely helps to knock of any scale
that might have formed. If you use the right temperature, you won't
get any scale, and you can forget about any quench. Just let the cases
air cool. Use swage lube on the punch when you draw the jackets. Just
slip them over the long, 0.2-inch diameter punch and push them into the
die, following instructions provided with the tool.
Rimfire cases are good to about 3,000 or 3,200 fps before they
start to come apart. Actual speed depends on rifling depth and
sharpness. They force you to load a .22-250 down to .222 Mag velocity,
but on the other hand, they also make you save powder, barrel, and cost
nothing for material. When they hit, you'd swear they were going over
4,000 fps compared to a factory bullet performance. And there is no
problem with barrel fouling or wear: if anything, the thinner jackets
are easier on your gun than a standard bullet. Try it! You will be
surprised at the accuracy.
.he CHAPTER 5 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #.op
SWAGING WITH THE MITY MITE SYSTEM
Swaging with the Mity Mite press and dies is a huge step up from
using a reloading press. It's faster, easier to use, more than doubles
the power you have, so that the effort is cut by more than half, and
extends the caliber and design range to dizzying heights.
You can obtain dies to make any caliber from .14 to .458, any
weight up to about 450 grains, with a maximum bullet length of about
1.3 inches. You're read about the CORE SEATING DIE, POINT FORMER, and
LEAD TIP DIE in the previous chapter (or, if you skipped it, you should
read it now). Let's explore other kinds of dies that can actually
adjust the weight of the bullet as you swage, or form boattails on the
normal flat-base jacket.
There are FIVE kinds of swage dies for the Mity Mite system:
(1) The CORE SWAGE die
(2) The CORE SEATER die
(3) The POINT FORMING die
(4) The LEAD TIP die
(5) The REBATED BOATTAIL die set
In addition to swage dies, there are draw dies, and special jacket
forming dies. Copper tubing can be formed into bullet jackets for
those calibers where regular drawn jackets are not available, too thin
for big game hunting, or too expensive and difficult to obtain. Tubing
jackets can be made in the Mity Mite in 0.030-inch wall thickness, in
the calibers from .308 to .458. The quality of such jackets is
outstanding, even if they are produced from ordinary copper water tube.
The literature that comes with the kit of dies explains the process in
detail. The one die that is used in this set and not discussed here is
the END ROUNDING DIE, which rolls over the tubing in preparation for
closing one end. In reality, it is simply a special size of point
forming die, with a round nose cavity and special punches for tubing.
The core swage die is made like a core seating die, except that
both the internal and external punches are very close, sliding fits to
the bore, and the bore is just large enough to accept a cast or cut
lead core. Also, there are three orifices in the walls of the die, at
120-degree positions around the circumference.
You can easily tell this die from the others by looking for these
three bleed holes. It is easy to determine which punches go with the
die: the punches are far too small to fit closely in any other die of
the same caliber set. Just try them by hand. If they fit smoothly
into the die cavity, they are right.
There are really two forms of core swage die. One is the ordinary
core swage, used to adjust the lead core weight shape before making a
bullet from it. The other is a variation called the LEAD SEMI-
WADCUTTER DIE, or LSWC-1. In the Mity Mite system, we place a -M after
the model number of the die set, and for the same kind of set in the
Hydro-press system, we place a -H after the model. There is no LSWC-1
or, for that matter, any kind of core swage or bleed-off die for the
reloading press.
The LSWC-1-M can be used to make a complete bullet in one stroke.
It has a bore size that is finished bullet diameter, and the punches
have ends that are shaped just like a reverse of the bullet nose and
base you want to form. Because the punch forms the nose by flowing
lead into its cavity, there has to be a small shoulder between the nose
and shank, where the edge of the punch presses into the core. The
LSWC-1-M cannot make a smoothly curved ogive without a step.
Let's make a bullet in this die. First, cut or cast a small
quantity of lead core as described in the earlier chapters. But leave
from two to five grains more lead than you actually want in the final
bullet weight. Locate your LSWC-1-M die set. You can see that the die
has no adapter body like the reloading press die.
The Mity Mite dies don't use an adapter body, because they are
made to screw directly into the RAM of the Mity Mite press! The die is
a very tough knurled cylinder of costly, special steel, heat treated in
electronic furnaces with a special kind of atmosphere. The Corbin
process of die-making has been developed over the past twenty years to
a level far beyond that used by most of the mass-production arms and
ammo companies. The dies you receive are superior in construction and
in design to the usual production die, and the bullets you can make in
them should be superior to those you can purchase, if you do your part!
The die has an internal punch, which normally is left in the die
(no need to remove it). It goes into the die from the threaded end of
the die. The threaded end of the die screws directly into the press
ram. This is just the opposite of reloading press dies, which screw
into the press head. In the Mity Mite, the press head holds a FLOATING
PUNCH HOLDER. This black oxide finished, 7/8-14 TPI threaded cylinder
looks like a reloading press die. But it holds the external punch.
The ram of the Mity Mite press is machined so it performs all the
functions of the universal adapter body. There is a shoulder that
stops the internal punch from coming out of the top of the die when you
move the ram forward to swage. There is also a hardened tool steel pin
with a knurled head, passing through a slot in the side of the ram.
This is the STOP PIN. It's job is to stop the backward movement of the
internal punch when you pull the ram back, so that the internal punch
is forced to slide forward and eject the bullet. You don't need a
mallet, ejector rod, or the power ejector unit with the Mity Mite.
When you consider the wide range of calibers, styles, and jobs
that Mity Mite dies must do, then think of the years of development
that went into the complete system of interchangable, simple dies and
punches to fit the Mity Mity press, you may realize why it is better to
purchase the ready-made system rather than trying to modify reloading
presses, come up with custom parts or tools, or try to modify dies to
work in arbor presses, hydraulic jacks, or vises. The universal
interchange of calibers, jobs, and styles in the Mity Mite system is a
major benefit, and the ease which which future changes or special work
can be done in this system makes it far more cost-effective than trying
to come up with one-of-a-kind tools for specific jobs.
The FLOATING PUNCH HOLDER, (Model FPH-1), is included with each
Mity Mite press. Instead of moving the die to adjust for depth of
punch insertion, you screw the die all the way into the ram until it
comes to rest on a shoulder. This shoulder, not the threads, takes all
the force. Adjustment is all done with the micrometer-like movement of
the threaded punch holder. Screw it toward the ram to make lighter
bullets, or to push a punch further into the core. Screw it away from
the ram to fit a heavier core, or to push a punch a little less far
into the die.
To install the LSWC-1-M die and punches in the Mity Mite, first
make sure that the internal punch is correctly placed in the die. The
internal punch has a 1/2-inch diameter head at one end, and a short
"tail" protruding from the other side of this head. The tail is about
5/16-inch diameter, and its length varies from a quarter inch to five
eighths of an inch, depending on the nominal weight (length) for which
the punch was designed. This tail, working with the over-all punch
length and the dimensions of the ram itself, determines the lightest
and heaviest weight of bullet that you can get into the die. Lighter
bullets require less of a tail, and heavier ones take a longer tail.
You don't need to know the technical details -- just let us know
what general weight range you want, and we'll see that the punch
provided will do it. If one punch won't handle the whole range, we may
suggest a second punch. Usually, the range is so great that you can
reasonably expect to make handgun weights with one punch and rifle
weights with another. The punch tail determines how much volume is
left in the die cavity, which
You don't need to know the technical details -- just let us know
what general weight range you want, and we'll see that the punch
provided will do it. If one punch won't handle the whole range, we may
suggest a second punch. Usually, the range is so great that you can
reasonably expect to make handgun weights with one punch and rifle
weights with another. The punch tail determines how much volume is
left in the die cavity, which nger pressure. It isn't necessary
to use a pair of pliers. Now identify the external punch.
The external punch fits the die cavity, but it has no "tail"
section on its half-inch diameter head. Whereas the internal punch has
to be as long as the entire die, so it can push the bullet out the
mouth, the external punch needs only to fit half-way or less into the
die bore. It is shorter. The part that is matched to the die cavity
diameter is less than half the entire punch length. There is a section
of the punch just after the head that is turned to about three eighths
of an inch in diameter.
This section slips into a hardened bushing that you will find
inside the floating punch holder. There are three parts in the punch
holder besides the body itself. First, there is a hexagon-shaped
bushing or retainer that threads into the mouth of the punch holder.
Remove this bushing. It should unscrew easily by hand. Inside the
punch holder are two hardened tool steel parts. One is a half-inch
diameter bushing or ring. One side is flat, the other curved.
This part is called the ROCKER BUSHING. It slips over the
external punch, so that the flat side rests against the head of the
punch, and the curved side faces toward the small end of the punch
(toward the die). On punches that must be made larger than 0.375-inch
diameter, the hex bushing and the rocker bushing are permanently
assembled to the punch. These punches must have the end opposite the
head larger than the standard hole size in the two bushings. We make
them fit the standard system by building them with a removable, cap-
screw secured head. We assemble them here, so you don't have to take
them apart and reassemble them every time you want to install a
bushing.
If your caliber takes a punch smaller than 0.375-inch tip
diameter, the rocker bushing and hex bushing supplied with the press,
in the punch holder, will easily slip over the punch. Assemble them
now. Put the hex bushing over the punch so it will hold the punch into
the punch holder. Look inside the punch holder. If you use your
little finger, or a toothpick, you can probably pick out the last part,
called the ROCKER BUTTON. This part looks just like the rocker
bushing, but is solid.
The rocker button fits into a V-shaped surface in the bottom of
the punch holder cavity. It allows the head of the punch to transfer
all the tons of swaging force to the punch holder in a safe manner, yet
still allows the punch to rotate slightly so it can line up with the
die bore perfectly. If the punch were held rigid, it could not self-
align or float to keep the punch perfectly aligned under stress. This
is another advantage of the Mity Mite system over other swaging
methods.
Notice that the rocker button has a curve on one side, and is flat
on the other. Make sure that you put this button into the punch holder
so that the curved side goes in first. You want the punch head to rest
against the flat side of the button. And the flat side of the rocker
bushing presses against the other side of the punch head. The curved
side of the rocker bushing matches a curve machined in the inside edge
of the hex bushing. When you screw it all into the punch holder, the
punch is held so that the exact center of its head is in the center of
a 1-1/4 inch ball, most of which is not physically present, but the
working parts of which are formed by the curves and their mating
surfaces.
You don't need to take any special precautions with this assembly.
It doesn't need oiling or maintenance. Just make sure you assemble it
correctly. Look at the pictures in this manual before you try it. If
any of the three parts are missing, your punch will not be properly
supported and could be damaged under swaging pressure. Many people
purchase spare punch holders so that they can assemble the punch and
leave it, locking the lock ring on the punch holder to repeat their
favorite adjustment quickly. This is nearly as fast as having several
presses, since it is the only adjustment that ever needs to be made.
With the die assembled into the ram, and the external punch in the
punch holder, back off the punch holder several turns away from the
ram. Pick up a core, moisten it with a little Corbin Swage Lube (or
Corbin Dip Lube, if you want to make a lead bullet with a wax film for
up to 1200 fps velocity), and place it into the die mouth.
The core must fit into the die easily. If it won't fit, it is too
large and you should not attempt to swage it. Never swage anything too
large to fit into the die by hand. If it is far too small, you will
tend to get folds and wrinkles in the shank, and it will be hard to get
enough weight without having the core stick out the die mouth. The
maximum length of core still must fit into the die before any pressure
is noticed on the handle. Never try to swage something that is just
barely inside the die, or sticks out of the die mouth.
Carefully move the ram forward so that you can align the external
punch and die. Don't pinch your fingers! Just help the punch go into
the die this first time, and then, when you have it inside, gently snug
up the hex bushing so that the punch doesn't move freely (it will still
move under swaging forces).
The Mity Mite press is so powerful it can pinch your finger off
just by dropping the handle with your finger between the die and punch.
Always keep your hand firmly on the handle when you are adjusting a
punch, and don't trust gravity or friction to keep the handle from
falling! I never place my finger between the die and punch. Any time
I make a manual adjustment or help the punch line up the first time, I
always keep my fingers on the sides of the punch, away from the tip.
If I should drop the handle on the press, the die would move my hand
out of the way. I might pinch myself against the end of the punch
holder, but that wouldn't be too bad.
If the punch won't reach into the die at this point, move the
punch holder forward. The ram should be moved to its foremost
position, so it reaches as close to the press head as it can go. This
happens at the point of maximum leverage, with the pivots in the handle
lined up in a straight line with the ram centerline. This press is
unique in having all its linkage and ram concentric and in a straight
line with maximum forward travel. Most presses have a side-torque
caused by offsetting the handle, and several can't reach full leverage
because they physically run out of travel before then.
If the die can't be moved forward because the lead core comes up
against the external punch, back off the external punch by turning the
punch holder. When you have the ram all the way forward, hold it there
and screw the punch holder toward the die until you can't turn it any
more. The punch will have come up against the lead core.
Back off the ram slightly, and move the floating punch holder half
a turn forward. Stroke the press forward again. Then pull the handle
back and almost, but not quite, eject the bullet. You can see the
bullet at the die mouth, ready to be ejected. Notice whether or not
the nose is completely filled out. If not, adjust the punch holder
forward another half turn and swage the bullet again. Within a few
strokes you will have the press set up so that the nose is forming
completely.
A small quantity of lead should begin to move out the bleed holes.
I like to make my cores so that about one eighth of an inch of lead
extrusion comes out the bleed holes on every stroke. Also, I like to
swage the cores so that they are double-swaged: every stroke goes over
and past the "top dead center" position, and then passes "over the top"
again on the back stroke. You will notice that the Mity Mite retracts
the ram slightly as you continue through the end of the stroke. This
slight retraction gives you a double-swaging action on each stroke, if
you use it.
If you eject the bullet and weigh it, you can see whether or not
to adjust the punch holder and in what direction. If the bullet is too
light, then you may need to adjust the punch holder away from the ram
(to make more room in the die at the end of the stroke, and extrude
less lead). If it is too heavy, then you need to adjust the punch
holder toward the ram (to reduce the volume in the die at the end of
the stroke, and force more lead out the bleed holes).
Obviously, if your lead cores start out too light, there is no way
to make them all weigh the same by swaging and still come up with a
heavier bullet. The only way to get consistent core weight by this
method is to start out with plenty of lead, and remove all the surplus
along with the variation. The hardness of the lead has a good deal to
do with consistency of weight. Harder lead will flow more slowly. You
may get variations in weight with harder lead, because you don't allow
enough time for the lead to quit flowing. I recommend only pure, soft
lead for the Mity Mite. You can get by with alloys of up to 3%
antimony, in the smaller calibers.
If you don't notice any lead coming out the bleed holes, stop
swaging and figure out whether the core is so short that it lets the
external punch move past the bleed hole location. If this happens to
be the case, then you need an internal punch with a shorter tail
section. Most people assume the external punch is too short. But
making it any other size tends to cause other problems. The right way
to adjust for extreme weight ranges is with the design of the internal
punch tail.
After you have swaged some bullets, the internal punch may be more
difficult to move. This is because the three extrusion holes in the
die become filled with the last lead wire extrusion made. The ends of
the lead wire press against the punch sides. This is normal. You
should still be able to remove and re-insert the external punch, though
there is no reason to do so unless you want to change to another style
(such as going from flat base to cup base).
Read this part over again and make sure you understand the
principle involved. This is the same operation you use with all the
various core swages and lead semi-wadcutter dies. It works the same
way whether you use the automatic proximity detectors and pressure
transducers of the Hydro-press or whether you do it by hand on the Mega
Mite or Mity Mite press. It doesn't matter whether you are making
benchrest .224 rifle cores, handgun .44 Magnum cores, or .40 Sharps
rifle bullets for paper-patching. Airgun pellets or precision lead
weights for phonograph cartridges all are made exactly this way.
Two notes about high precision: (1) Make sure the ram does indeed
go past the "top of stroke" position each time, and (2) try to use the
same timing for each stroke. Timing is important because lead flows on
an exponential curve with time. Lead has a creep rate that can
continue for years under a constant low stress. If you maintain a
steady rate, your cores will come out much closer than if you whip the
handle back and forth one time, and lean on it to drink a cup of coffee
the next.
You should be able to get less than 1% variation in total core
weight on your first attempt. If you are really good, you can get less
than 0.5% variation. Some people actually achieve such high precision
that there is no discernable weight variation on a normal reloading
scale. It is all the same equipment. Your skill in operating it makes
the difference.
But think about what this means: If you start with a 100 grain
core, one percent is one grain. Half a percent is half a grain. With
a 50 grain core, one percent is half a grain. With a 500 grain core,
one percent is five grains. In other words, don't just expect half a
grain or less on everything, because it is very sloppy for light
bullets and beyond any reasonable expectation for heavier ones.
Besides which, weight variation alone has very little to do with
accuracy.
Weight variation that is caused by differences in jacket thickness
or alloy composition is a bad thing for accuracy. It means the trouble
is elsewhere, and it means differences in bore friction, bullet upset,
and other factors. Weight variation that is merely the result of
having another grain or two of lead is quite insignificant. I have won
matches with bullets that varied more than five grains in weight.
Fortunately, there was nothing else wrong with them. A great number of
factory bullets have horrible weight variation from lot to lot. If it
came from having more or less core material, I wouldn't worry about it.
But usually it comes from having differences in jacket material, and
that affects groups.
You've made some nice lead semi-wadcutter bullets now, using the
LSWC-1-M, and they are ready to shoot if you used Dip Lube on them.
Using Corbin Swage Lube, you would have made lead cores that could then
be further processed into bullets. In that case, you would want to
clean off the cores to remove any lube before putting them into
jackets. The reason is that any lube inside the jacket contributes to
a possible unbalance of the bullet.
Put the cores in a strainer or wire basket and slosh them around
in a strong solvent. Corbin Cleaning Solvent comes in pint cans, and
is able to remove any lubricant traces, fingerprints, and grease from
either cores, jackets, or from your guns. It will remove some
finishes, too, so be careful around stocks and table tops! After
cleaning the cores, spread them out to dry. Change the core swage die
for the core seating die.
We've already talked about the reloading press core seating die.
It is exactly like the one for the Mity Mite and Hydro-press systems.
Only differences in size and how it is held in the press apply. A core
seating die looks like a core swage without any bleed holes. That is
your first clue. The second is that the bore is larger, and it accepts
the right caliber of jacket for the bullet you want to make. Try a
jacket in the die -- if it fits, probably it is the same caliber as the
die. A positive test for caliber is to swage a lead core in the core
seating die, and then use your trusty micrometer to measure the
diameter of the lead after swaging.
Core seating dieore swage without any bleed holes. That is
your first clue. The second is that the bore is larger, and it accepts
the right caliber of jacket for the bullet you want to make. Try a
jacket in the die -- if it fits, probably it is the same caliber as the
die. A positive test for caliber is to swage a lead core in the core
seating die, and then use your trusty micrometer to measure the
diameter of the lead after swaging.
Core seating dies or rifle
bullets, and there is no need to purchase another special die for lead
bullets, and (2) you can sometimes get a more precisely formed bullet
for critical applications by doing it in more steps. This is
especially true for harder lead alloys.
The internal punch of the core seating die fits into the die bore,
and either has a flat face, a probe (for hollow base bullets), a dome
(for a dish or cup base bullet), or it can have a cavity (for some
kinds special bases, not usually on jacketed bullets as the jacket edge
has a hard time jumping over the edge of the punch). The external
punch can be almost anything!
If you want to make a handgun bullet, the external punch will have
a nose cavity shaped like a mirror image of the nose. This is only for
lead nose bullets, not for those with the jacket curved around the
ogive. If you want to make an open tip bullet, as most rifle bullets
tend to be, then the external punch should fit into the jacket rather
than the sides of the die. This means that the external punch can be
quite a bit smaller than the die bore.
A hollow point bullet uses a core seating punch with a probe
machined on the tip. This probe pushes down into the lead core and
displaces lead around itself. The punch is made so that it centers
itself either in the jacket (for an internal hollow point, having the
jacket wrapped around it), or on the die walls (a typical lead tip
hollow point). This keeps the cavity concentric with the sides of the
bullet.
You can use another external punch in the same die. First press a
cavity into the lead core, as deep as you wish (you don't have to use
the full extension of the punch into the core, you know...). Then,
change punches and push a Keith nose or a round nose punch into the
die, setting the adjustment so that you don't completely reform and
close the cavity you just made. Again, you will soon see that there is
a lot of control possible between not forming the bullet sufficiently,
and completely forming it to the punch shape.
Your first punch should be used with reasonable force, compressing
the lead core and filling out the jacket to meet the die walls. It
should leave the jacket and core in the die, not pull it out with the
punch. But any subsequent punch that you want to use does not have to
be pushed so far or hard into the core. The shank is already formed.
Everything else is just a matter of styling the bullet. Go ahead and
experiment. Two punches can make twenty different bullet shapes if you
use them with various degrees of insertion and in different orders.
But the point forming die really brings out the power to
experiment! You read about this die already under the reloading press
section. It has a cavity shaped just like the bullet, except there is a
little hole in the tip for a strong, spring-wire ejection pin to push
the bullet back out again. In the Mity Mite system, this die has a
major difference from the reloading press types. It has a captive
internal punch instead of a retraction spring.
You'll recall that the point forming die has a very small ejection
pin instead of a conventional internal punch, and it is held out of the
die cavity by a spring. In the Mity Mite press, there is no spring.
That stop pin we discussed earlier is pulled out of the top of the
press, and slipped into a slot in the head of the ejection pin after
you screw the die into place. Don't forget to do this, or you can
damage the ejection pin.
The first thing I do is pull out the stop pin. Then I place the
ejection pin in the end of my point forming die (it goes in from the
threaded end, just like all internal punches in all dies), and screw it
into the ram as one assembly. With the ram in the right position, it
is easy to grasp the tip of the ejection pin while it sticks out the
die mouth. I do this, and slide and turn the ejection pin until I can
see the slot underneath the stop pin hole. Then I push the stop pin
back into place, and give the ejection pin a tug to make sure it is
actually locked in place.
Now, the ejection pin will be retracted automatically from the die
without any spring pressure, and it will be held in place to eject the
bullet. The Mity Mite system has less of a problem with a stuck
bullet, since you can use the press to retract the pin again and make
another attempt to swage it. If you feel resistance to ejection, it is
usually better to unscrew the die and use a short piece of the same
diameter of spring wire as the ejection pin, along with a small mallet,
to tap the bullet out. This happens when you use over-sized
components, try to reswage a finished factory bullet in the same
diameter of die (many people do this, not realizing that you usually
need a slightly larger die for it to work), or forget to use the right
lubricant.
The most common problem people have when first starting to swage
is bending the ejection pin. After a while, you get a better feel for
the kind of resistance that is normal, and bent pins become less and
less frequent. It is a good idea to purchase spares if you would be
under any pressure because of having your set out of commission for a
little while due to a damaged ejection pin or a stuck bullet (usually
the cause). One or two spare ejection pins can save your day.
Now let's talk about a set of dies that we usually consider one
package: the RBT-2 set, or rebated boattail forming dies. This is
actually a matched pair of dies, not just one. They replace the usual
straight-walled core seater whenever you want to make a rebated
boattail bullet.
A rebated boattail bullet has a step, or shoulder, like a Keith
nose on a pistol bullet. That step acts like a spoiler to break up the
blast of hot muzzle gas just as the bullet exists your barrel. On a
conventional smooth boattail design, the gas flows with the streamlined
shape and zips past the bullet, flows along the ogive, and then breaks
up right in front of the bullet as it tries to get away. A boattail
means that you are probably shooting through your own muzzle blast
turbulence! That can add perhaps another 10% error factor to the
bullet dispersion.
The small rebate has a minor drag effect, but over-all, the
improvement in total performance is greater. Not only do you gain
ballistic coefficient by reducing base drag, but you also retain the
natural good disperson characteristics of the flat base bullet during
that critical exit time from the muzzle. Add to that the fact that the
dies and punches last longer, there is less gas cutting and a better
seal in your barrel. Those are compelling reasons to forget about a
conventional boattail design if you have the option of making your own
bullets.
The process is just like seating a regular core. You use the same
external core seating punch that you would use with your flat-base core
seater. But instead of using the flat base core seating die, place the
core and jacket into the BT-1 or BOATTAIL PREFORMING die. This die has
a standard boattail shape inside. You push the flat-base jacket into
this die, seat the core, and the jacket is converted into a boattail.
Having this taper on the bottom of the jacket makes it easy to
form the rebated step or edge. The next die, BT-2 or RBT FINISHING
DIE, has a shoulder that transposes itself into the jacket when you
once again seat the core. If you tried to use this die alone, the
shoulder would catch the jacket bottom and tear it. But the taper gets
the bottom of the jacket past the shoulder before any real pressure is
applied. The jacket moves outward to take on the die shape, instead of
trying to draw over this shoulder.
Included with the RBT-2-M set (which can be purchased as an add-on
to a conventional three-die or four-die set) is a special external
punch for the point forming die. This punch has a cavity in the tip,
to match the shape of the boattail. The punch supports the rebated
boattail shape, and keeps it from being mashed out of form. The punch
is a little fragile, so don't use it for other experiments without
considering the forces you plan to apply to those edges.
In a short, fat pistol caliber, you can use a Keith nose punch for
a rebated boattail bullet. First form a conventional jacketed bullet
with a nice truncated conical nose. This is done in the point forming
die. In fact, you can make the whole bullet in the point forming die
if you put the jacket into this die backward (base first) and then use
a core seating punch to seat the core. Eject this bullet, turn it
over, and now you have a tapered section facing out of the die and an
open tip flat end facing in. Use the Keith punch to push the bullet
into the die.
The tapered nose will fit into the Keith punch nicely, and will be
made into a rebated boattail base. The flat open end will be formed
into a new nose in the point forming die. It is simple, effective, and
the bullets seem to gain between 20% and 40% in ballistic coefficient
at subsonic speeds. This doesn't work if the bullet is much longer
than its caliber, so don't try it with conventional rifle bullets.
Lead tip dies for the Mity Mite system are just like those
described for reloading presses, except, of course, they are made to
fit the press ram. They look very much like a core seating die. Some
people wonder why we can't use a core seating die. The reason is that
the bullet won't slip back into the core seater after it is finished at
full diameter. It will go in, but only under some force. And the
force is greater than that required to form the lead tip.
Making a lead tip bullet requires a little experience. At first,
you will probably have some experimenting to do, because you need to
have just enough lead protruding so that the cavity in the internal
punch of the lead tip die can reshape it fully. Too much lead showing
doesn't hurt, but too little is a problem. It can't fill the cavity,
and won't shape up properly. With the lead tip die, it is necessary to
use very light pressure. Pressing too hard makes a ring in the ogive
of the bullet. In some small tips, it helps to grind a sharp wedge
shape on the ejection pin of the point forming die. Then, the ejection
pin will split the protruding, deformed lead and come to rest against
the jacket edge.
The jacket edge won't split easily, so the bullet can be ejected.
Then, when you put the bullet into the lead tip die to finish the end,
the neatly split blob of lead will reform nicely and become whole
again. This technique is useful for problem cases, where one must have
a small tip size and bring the jacket nearly closed. Generally it
isn't required. Large handgun-style lead tips, which are probably a
quarter of the caliber or more, don't generally require the lead tip
die in order to form properly. A conventional three-die package for
open tip bullets works well for making large lead tips of this type.
The lead tip die (LT-1-M) can be purchased separately as an add-
on, or it can be included with your set of dies in the LTFB-4-M, RBTL-
5-M, or the FRBL-6-M sets. These all have an "L" in their catalog
number. The "L" stands for "Lead Tip". All it means is that a lead
tip die has been included: you can still make open tip bullets. All
the various sets of dies are assembled from the same basic individual
dies. Everything but the LSWC-1-M set starts with a core swage and a
core seating die, and adds a point forming die, and various
combinations of lead tip and rebated boattail dies.
A "FB" in the catalog number means "Flat Base". It indicates that
you have a standard core seating die in the package, not necessarily
that you are limited to flat base rather than cup, dish, or hollow
bases. In fact, if you order a pistol set with the cup base specified,
you could very well receive a set that doesn't have a flat base punch
at all, but it still has the basic ability to make one if you get the
right punch. We'd still call it a "FJFB-3-M" if it has a core swage,
core seat, and point forming die.
The "FJ" only stands for "Full Jacket", and is primarily to fill
in space in the catalog number, since any set with a point forming die
can be used to make a full jacket bullet. The letters "RB" or "RBT" in
the catalog number stand for "Rebated Boattail", and they mean that the
two RBT dies are included, along with the proper RBT punch for the
point forming die. If the "F" for "Flat base" is also in the catalog
number, then it means that you can make both flat and RBT bullets.
Both the standard core seater and the two RBT core seaters are
included, in that case.
The number in the catalog number tells how many dies are in the
set. For instance, in a "FRBL-6-M" set, you have flat base (F) core
seater, two RBT core seaters (RB), a lead tip die (L), and of course a
core swage and point former, which are assumed present in anything
above a two-die set. That makes six dies, ae both flat and RBT bullets.
Both the standard core seater and the two RBT core seaters are
included, in that case.
The number in the catalog number tells how many dies are in the
set. For instance, in a "FRBL-6-M" set, you have flat base (F) core
seater, two RBT core seaters (RB), a lead tip die (L), and of course a
core swage and point former, which are assumed present in anything
above a two-die set. That makes six dies, a one die with matching punches, and it makes the same kind of bullet
with the exception that you cannot use jackets so long that they cover
the bleed holes. That means half-jacket and straight lead bullets are
the proper kind for a LSWC-1-M.
The techniques of swaging are covered in much greater detail in
the other books. I recommend that you invest a little time in reading
about the process, if you have not done it before. Bullet swaging is
quite simple, but also quite powerful. Because there are so many
possible variations, it is far more important to learn the principles
than it is to try and follow a block of pictures and repeat each step
exactly. With six different kinds of dies, and hundreds of different
techniques and styles in thousands of calibers, can you imagine the
number of pages you'd need to keep on hand, in order to have a "1-2-3-"
cookbook to follow for each possible bullet you wanted to make?
On the other hand, if you understand how a core swage works, how
to use a core seater, and what kind of bullets you could expect from a
point forming die and a lead tip die, you can work out all the
variations for yourself, and probably come up with others that none of
us have yet discovered! In the Mity Mite system, pressures run from
20,000 to 50,000 psi or more. That is some kind of power! And, it's
all under your control.
.he CHAPTER 6 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #.op
SWAGING WITH THE HYDRO-PRESS SYSTEM
The manufacture of custom bullets has grown tremendously in the
past decade: people with a diverse range of jobs (and quite a few who
were between jobs), people who had successful professional careers,
have found custom bullet manufacture to be pleasant, profitable, and a
wonderful way to plan a comfortable retirement income or to build a
business at low cost that can be turned over to a son or daughter.
There is no typical custom bullet maker, as far as I can tell. I
know doctors, carpenters, locksmiths, attorneys, laborers, people who
had severe physical handicaps, people who are the picture of a robust
outdoors athlete, people with gruff personalities and a lot of
mechanical aptitude, and people who are extremely pleasant, quiet types
who have a hard time with a screwdriver. All of them seem to be doing
quite well in the custom bullet field.
Today, you can purchase a complete package, ready to start
production of bullets so advanced, and so difficult for mass
production, that none of the big names in bullet making can compete
with you. It may seem hard to believe, but none of them have machinery
capable of forming some of the extremely tough, thick jackets, in
heavier weights of large calibers, that you can easily make on a small
machine that fits in your den or garage.
The reason they don't (and can't) compete in so many areas is
their committment to volume. Their very size dictates that limited
production items are not profitable to them. The wiser executives at
these firms welcome my customers into the field: they know that the
need for quality specialty bullets can be met by custom bullet makers
and that there is no direct competition, but in fact a benefit: they
can now forget about pressure to make unprofitable (to them) small
runs, and just refer clients to you, the custom bullet maker.
Besides, the kind of equipment needed to mass produce heavy walled
jackets in larger diameters is extremely expensive. The stroke length
and tonnage of the multi-station presses for high speed production is
quite beyond anything used for ordinary target and smaller diameter
hunting bullets. It would cost a minimum of half a million dollars to
install the equipment required, and the market for specialty bullets of
this kind is far too small to be investing even that kind of money, not
to mention the promotion, inventory, and special materials required.
On the other hand, what is unprofitable to a big outfit is enough
to keep a family or two living in high style! A custom bullet
typically is sold for prices from 50 cents to over two dollars per
bullet. They are NOT price competitive with mass produced bullets, and
they don't have to be. Even at twice those prices, there are between
ten thousand and one hundred thousand (typically fifty thousand)
bullets sold in any given specialty size and caliber each year, on the
average.
Who pays that for bullets? People who own exotic calibers.
People who like to hunt big game and have experienced repeated failures
of cheaper mass produced bullets. People who want a specific weight or
style in some caliber and don't mind investing a little more than usual
to try it. People who... well, basically, people interested in
something better, different, or unavailable elsewhere at any price.
You don't sell a lot of these bullets to local plinkers, of
course. But serious competitors, people spending five thousand dollars
or more to make a trip to Africa for hunting, special police teams who
need bullets of unusual design for tactical situations, and the
everyday handloader with a spark of curiosity in his soul -- these
people are the ones who produce backlogs for my customers, often
cleaning out their entire supply at trade shows or by magazine
advertising sales.
The machine that makes it possible is the Corbin Hydro-press.
Everything about the machine is designed so that you can get into the
field at minimum cost, and grow without having to worry about
outgrowing the capacity of the equipment. It is capable of forming
solid brass bullets in one stroke, making a 10-gauge shotgun slug from
a chunk of raw lead, forming partitioned jackets in heavy tubing,
making brass, copper, or even steel jackets with thin or heavy walls,
and extruding lead wire in any diameter.
It can turn right around and reload some ammo for you, too, using
regular RCBS type dies and shell holders. When you suddenly realize
that all your reloading presses are now complex progressives or
turrets and you have lost the old rugged simplicity of a powerful
single-station machine, the Hydro-press greets you with a "can-do!" and
barely begins to unleash its tremendous power on jobs that would
shatter the fragile parts of modern reloading machines.
It's not large -- only 34 inches tall, 23 inches wide, and 15
inches deep (about like a small refrigerator). But the design is the
essence of rugged simplicity. We use a Hydro-press to cold-forge steel
parts (used in other Hydro-presses, by the way!). It can stamp, blank,
coin, trim, and punch steel, in addition to its regular duties as a
profit center for your bullet making.
The major advantage of the Hydro-press is its built-in electronic
controls and logic circuits: the "brains" of the press and the
sensitive transducers that tell it what is going on in the world.
Anyone can assemble a hydraulic cylinder to a ram, somehow adapt it to
a set of dies, and let it slam blindly back and forth. That won't make
good bullets, however. The ability to control pressure in the die,
exact position of the punches, and precise amount of time that the
pressure is being applied, is needed in order produce a consistently
good product.
The Hydro-press uses transducers that sense the position of the
ram and control its movement though logic circuits. The earlier
versions used high quality limit switches to tell top, bottom and
loading position. Current versions use electronic proximity detectors
that have no moving parts and do not contact the ram. Solid state
timing controls the application time of the pressure. Pressure
transducers control the level of pressure applied. All this is
automatic, locked away in the steel innards of the cabinet.
What you see is a colorful Lexan-laminate-on-steel top panel, with
a digital counter, adjustable inspection light, key-locked power
switch, selector switches for various modes of operation, and brightly
colored oversize push-buttons to cycle the press. At the left rear
corner of the cabinet is a massive steel press head with inch-thick
plate for a base and head, and hardened, ground tool steel ram and
guide rods running on bearings.
As powerful as it can be, the Hydro-press is also sensitive. You
can set the pressure, speed, and timing in seconds. It can reload a .25
ACP case just as easily as it cold-flows a solid hunk of copper. Blind
force cannot begin to accomplish the tasks you can handle with the
intelligent Hydro-press system. The dies and tooling for the Hydro-
press are capable of sustaining much higher pressures than smaller dies
for the reloading press or Mity Mite. They use 1.5-inch diameter
blanks, with 1-12 TPI threads. The press head accepts a floating punch
holder with 1.5-inch by 12 TPI threads, and an adapter for standard
7/8-14 TPI dies as well. The ram can be adapted to 7/8-14 TPI, or to a
conventional shell holder. Shell holders for 20 mm and for 50 Browning
Machine Gun cartridges are also available.
Fifty caliber MG dies (for reloading) are made by C-H Dies and
they fit directly into the head of the Hydro-press. I recommend them.
Corbin builds a lead wire extruder kit, jacket maker kits, and of
course the full range of bullet swaging dies for the Hydro-press.
Calibers are virtually limitless. No small arms bullet is too
large. Weights and styles are also quite open to a wide range of
designs. If you want something that cannot be made in a hand press,
this is the system that is most likely to handle it. (If the Hydro-
press won't handle it, chances are it cannot be done.)
The dies and punches are massive, far too large for use in a
reloading press or the Mity Mite. And smaller dies do not fit into
this press for good reason: it would be too easy to destroy the dies
by using pressures only a Hydro-press die of that caliber could
sustain. All of the kinds of dies previously discussed are available
in this system. They work the same way. The only difference is that
the die goes into the ram so it faces straight up, and the external
punch fits into the floating punch holder so it faces straight down.
This arrangement makes it possible for you to drop a component
into the open mouth of the die, then move your hands back to the two-
hand, safety controls to start the stroke. In the key-locked manual
start mode, it would take a contortionist to put a part of their body
in the way of the moving ram. (An automatic mode, controlled by the
key switch, is also available -- you need to know the code sequence to
start it. It is handy for sizing long runs of cartridge cases with the
ram set for a moderately slow travel).
Rather than describe all the modes and controls of the Hydro-press
here, I will refer you to the book "POWER SWAGING", which is all about
the use of power presses including the Hydro-press. Basically, the
adjustment is still done with the punch holder, just as it is in the
Mity Mite. The main difference is that you can control exactly where
the start and stop of the stroke takes place, so that the stroke length
is adjustable to precisely what you need for any job. (Up to six
inches of stroke can be used, if need be!)
The press can stop and reverse itself, after a applying pressure
for whatever time you tell it (0.1 to 10 seconds). It will continue
down, eject the bullet gently to the top of the die, and then raise
slightly to retract the internal punch so you can put another component
into the die. The point at which it reverses can be a physical
location set by the position transducer, or it can be a pressure level
achieved by the compression of the material, sensed by the pressure
transducer.
Naturally, if you set the press to stop when it reaches a certain
position, it is possible to adjust the punch holder so that the bullet
has yet to be contacted, or so that it is pushed too far for the shape
you want. I like to set the stroke length first, leaving myself enough
room to easily put components into the die but not wasting time moving
the ram any further than it needs to go. Then, after I have a pleasant
working stroke length set up, I back off the punch holder, put a
component into the die (core, jacket, whatever I might be doing at
the time), and run the press ram up to the top of its stroke.
With the position switch and pressure switch both turned off, the
ram will simply stop when it reaches this point. It is now as far up
as it will go during this particular job. Then, I screw the punch
holder down by hand, until the punch contacts the material within the
die. I back the ram down slightly (press the green "ENERGIZE" and
yellow "DOWN" buttons, then release them after the ram moves down a
bit). Then I give the punch holder another quarter to half turn
downward, just to put some compression on the component on the next up
stroke.
The ram is then moved up (press the green "ENERGIZE" and the red
"UP" buttons). Again, with pressure and position switches turned off,
the ram will do one of two things: if the component is being
compressed and is resisting with pressure equal to that of the press
(as read on the gauge), then the ram will simply stop and hold the
pressure. I can read it on the gauge, and I can hear the motor and
pump inside the cabinet as it pushes oil over the by-pass valves. Or,
if the pressure I have set is great enough to move the component into a
more compact shape, so that the position sensor is activated, then the
pressure gauge will drop to zero, the red LED light on the top position
sensor will come on, and the ram will stop. The motor and pump will
make their usual idling sound.
It's easy to tell whether or not you have formed the component to
a limit that was set by position or by resistance to the pressure. In
some jobs, you want consistent pressure. This would be true of a core
seating operation. The Hydro-press can form seated cores far more
accurately than you can do it by hand, on the larger calibers. (On
small calibers, I still think a person can do it better -- given enough
experience).
But on a core swage operation, or when making a lead bullet with a
LSWC-1-H (note that the die designations are the same as the Mity Mite,
except that the letter "H" is added to indicate the big Hydro-press
design), using constant pressure would simply move all the lead out
through the bleed holes! It would come out very consistently, under
the precise control of the pressure and logic circuits, but there would
be no indication of when to stop pressing.
In this operation, you adjust the pressure sensor to a value lower
than that listed in "POWER SWAGING" as maximum safe pressure for the
caliber of die. Then, you actually stop the ram using the position
sensor (turn on the "POSITION" switch). The location of the top
position transducer will control the length and weight of the bullet in
this case. It is extremely important to use sensitive, high-quality
transducers for this kind of work, because variation in their range of
sensing will cause variation in bullet weight. I use a highly precise
electronic proximity detector that can sense position within millionths
of an inch, far better than the human eye.
In manufacturing a bullet jacket with the Hydro-press, the same
basic steps are used as with thinner materials in the Mity Mite.
First, a piece of tubing is cut to length. The length is determined
experimentally and is different for various weights, styles of tip,
ogive radius, and kinds of bases, as well as for partitions or
conventional cup jackets. (We work this out when we build the dies --
design is a large part of the making of a tubing jacket set).
Tubing is cut to length using a turret lathe with air feed, or an
automatic screw machine. Corbin cuts tubing for customers, and
furnishes the correct temper and wall thickness, alloy and length to
make the bullet you order. Or, you can farm this out to a local job
shop, or cut the tubing yourself with a fine-tooth saw (bandsaw,
circular saw, or even a hand saw, using a V-block and a stop to get
even, square cuts).
Boxes of from 100 to 5000 pieces of tubing are normally purchased
with the dies. One end has been deburred and chamfered. The other is
left with as much of the cut-off burr as possible on it. It will form
the base, so any extra metal is welcome and causes no problem. The
piece of tubing is placed over a punch that fits precisely inside, with
a length that allows at least half the caliber length of tube to
protrude beyond the punch tip, unsupported.
The punch has a shoulder that presses on the other (chamfered) end
of the tube. One simply installs the END ROUNDING die (or, as some call
it, the JACKET MAKING die) in the press, making sure that the steel pin
that passes through the punch head is indeed installed correctly (on
top of the knock-out bar, but under the retraction spring -- pictures
in POWER SWAGING illustrate how). Thof tube to
protrude beyond the punch tip, unsupported.
The punch has a shoulder that presses on the other (chamfered) end
of the tube. One simply installs the END ROUNDING die (or, as some call
it, the JACKET MAKING die) in the press, making sure that the steel pin
that passes through the punch head is indeed installed correctly (on
top of the knock-out bar, but under the retraction spring -- pictures
in POWER SWAGING illustrate how). Th end of the tube will now be rounded like a round
nose bullet, and will have a small projection on the end. If the tube
isn't closed this far, check the position sensor and make sure that the
right pressure is being used, and the position sensor isn't coming on
before that pressure is reached. (If it is, move the floating punch
holder down a bit -- don't adjust the position sensor).
The next step is to draw that piece of rounded-end tube to a
diameter that will fit into the core seat die for your caliber. Draw
dies are part of the jacket-maker package if they are required. Again,
it is the working system you are purchasing, with all the development
and testing that went into making it work with as few steps as
possible, not a specific number of parts. We provide what it takes to
make the jacket. Sometimes it takes thousands of dollars worth of die-
maker labor to develop some little change that you might desire, but we
don't charge you for it. On the other hand, if we can come up with a
process that eliminates one or two steps by putting in all this work,
then I think you can see that it's a better deal even if you don't need
some specific die or punch that might otherwise be included.
I mention this because not every jacket design is made the same
way. Some alloys, thicknesses, calibers, or combinations of jacket
features take differnt paths during production. Because this is almost
entirely unique, one-of-a-kind development work done just for you, to
make your bullet, it is impossible to predict whether your set will
include any given number of punches, dies, or whether certain steps
will be necessary in advance. Instructions are written after the set
has been developed and tested. Generally, they all follow the process
oulined here. Sometimes there are radical exceptions.
Rather than charging you for full shop time every time something
requires a lot of working out, we just have one standard price for a
package of tools we call the "Copper Tubing Jacket Maker Set", or
"CTJM-1-H". This set is NOT a fixed physical number of parts, but
varies with whatever is needed. You are purchasing the completed
concept, the process of manufacturing something that no one else in the
world has worked out quite this way. If it takes an extra die or two,
then the extra material you got may be considered a bonus -- I would
consider it unfortunate, since it makes the bullet manufacture a little
slower. On the other hand, if we were able to eliminate everything but
one or two dies in the set, you might consider it an over-priced set if
you just looked at the parts received and not at the time that went
into developing this faster, easier method for you. I would consider
it a blessing that someone had eliminated all the extra steps in my
bullet making operation!
But, as I was saying, the next step is usually to draw down the
end-rounded tube. For this, a die is provided. The die fits into the
head of the Hydro-press, using an adapter that takes it from 7/8-14 TPI
to the 1.5-inch by 12 TPI press head. Adapters are available
separately, if you want to permanently install one on each die for
convenience, or you can use the one that comes with the press, and
simply change the dies.
A very long punch is provided, with a base that looks like a die.
It screws directly into the press ram. This drawing operation is
exactly a mirror image of the usual swaging set-up. The die and punch
positions are reversed, and of course there is no internal punch since
the draw die is an open, annular or ring die. The tubing is simply
dropped over the punch and pushed through the die, coming out the top.
After drawing, the tubing normally must be annealed to avoid
cracks in the base. We make a very nice electronically controlled
furnace for this, which can be optionally equipped with a Nitrogen
atmosphere for even greater control (no scale, no oxidation). If you
don't feel ready for the electric furnace (which is the same quality
that we use to make our dies, by the way), then a propane or gas
welding torch will do. Heat the tip red and drop the jacket in water.
The water quench is to knock off scale. It doesn't do anything for the
anneal.
Now remove the draw die and punch, replace the floating punch
holder, and install the regular core seating die from whatever swage
set you plan to use with these jackets. Some kinds of jackets,
especially partitioned ones, have a different internal punch to
install. Instructions will be included with those sets to tell you
how. Otherwise, just use the normal flat internal punch. The external
punch is a special one in all cases, however.
The external punch is made for a specific wall thickness and
length of tubing. It fits into the jacket, supporting the walls while
pressing on the open mouth. The length of this punch is a bit shorter
than the end-rounding punch, but otherwise they appear to be similar.
The END-FLATTENING punch, as it is called, fits inside the drawn jacket
snugly, but it does fit. The end-rounding punch only fits inside the
tubing, before drawing.
As with most swaging tools, sorting out the parts is just a matter
of knowning what they are supposed to accomplish, then seeing if they
fit into the parts they are supposed to fit. If they don't fit by
hand, chances are they are not the right parts. If they do, then they
probably are!
The purpose of the end-flattening punch is to flatten the rounded
end of the tube, and make a closed jacket. Application of the
recommended pressure, as given in the instructions that come with the
set, will produce a flat base. The jacket is now finished! It can be
used just like any other jacket. The operation just described can be
applied to the Mity Mite system, using the 0.030-inch wall tubing
suitable for this press. Tubing jacket manufacture is considerably
easier and faster on the Hydro-press, even with thin jackets, since the
stroke length is considerably greater and the press has full power
anywhere in the stroke.
The Mity Mite and the Hydro-press systems both use different size
dies, and do not interchange. The Hydro-press can use reloading press
swage dies, though I don't recommend the practice: it's too easy to
over-stress a swage die by applying more pressure than the recommended
limit (the charts in POWER SWAGING are for Hydro-press dies, not the
smaller diameter reloading press dies). However, the Mega Mite press
is a common ground for all Corbin dies.
.he CHAPTER 7 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #.op
SOME SPECIFIC BULLETS AND HOW TO MAKE THEM
I've already written seven books and my editors tell me I have
over 400 articles in print, describing the various things you can do
with swaging. It would be ridiculous to try and explain every possible
bullet style in this book -- you'd need a flat-bed truck to haul it out
and a crane to flip the pages!
Rather than that, I will try to explain how each of several
examples of bullets can be made, selecting very simple and very exotic
kinds of bullets, including features that shooters find exciting, and
designs that appear difficult or impossible until you have seen how
simple swaging makes it. From these few examples, you should begin to
gain an understanding of the process and how much more you can do with
it.
HOLLOW BASE TARGET PISTOL WADCUTTERS
Lead wadcutters with hollow base can be made in a reloading press
in the calibers from .25 ACP to .357/.38, up to .458 caliber in the
Mity Mite, and up to .75 caliber in the Hydro-press. The reloading
press makes as accurate a bullet in regard to diameter control, but for
superior weight control, you should use the Mity Mite or larger swaging
presses.
Select either a core seating die or a lead semi-wadcutter die.
The core seating die should be ordered with a wadcutter nose external
punch, and a hollow base internal punch. So should the LSWC-1 die, if
you wish to use that one. (I would -- it isn't available in the
reloading press system, however.)
Prepare your lead cores by either casting them in the Corbin 4-
cavity adjustable weight core mould, or by cutting uniform length
pieces from a spool of lead wire. Specific instructions are found with
the tools or in other sections of this book. More detailed information
can be found in the book "Rediscover Swaging".
To establish the proper weight of core, make one and put it in a
scale pan. Then adjust the next few until you get what you want. If
you plan to use a core seating die (CS-1) without a core swage (CSW-1),
then what you put in is what you will get out in regard to weight.
This is the case with reloading press die sets, since there is no core
swage for them. It isn't necessarily a bad situation. I shot a lot of
good groups when I was in the Navy using bullets that had 3-5 grains
variation in my trusty .45 Colt Government pistol.
If you do use the Mity Mite or other special swage press, and plan
to use a core swage or the all-in-one lead semi-wadcutter die (LSWC-1),
then make the cores from 2 to 5 grains heavier than you want in the
bullet. That gives you some extra lead to extrude along with any
variation in weight.
Lubricate the core by one of two methods. If you want a clean
lead bullet with no lubrication, use Corbin Swage Lube on your finger
tip and thumb, and just give each core a little rotation between them
as you pick them up to put them in the die. It's simple and natural,
no big deal. Let the benchrest rifle fanatics worry about measuring
out lube with a hypodermic needle on a special stamp pad: it won't
make any practical difference in where the bullet lands.
The other method is for placing a wax jacket on the bullet itself.
Instead of lube grooves which apply a little band of lube and let the
rest of the bullet scrape along the bare metal contact with your bore,
the whole surface of the bullet can be covered by a thin, hard film of
high temperature wax.
The product that does this is Corbin Dip Lube. Some call it
"Liquid Jacket". That's what it acts like. You dip the core in a
small container and put it wet into the swage die. Then apply
pressure, swage the bullet, and it comes out nearly dry. Let it cure
for fifteen minutes, and you are ready to load and shoot it! No
sizing, no lubricating, and more lube contacts the bore than if you had
it plastered with conventional drag-producing grooves.
Drawback? Alox-beeswax lube works at somewhat higher velocity
levels than Corbin Dip Lube. If you are pushing the bullets toward
magnum speeds, you may be in for some leading. On the other hand, that
is what Corbin bullet jackets are made to prevent. From 1,200 fps
down, I have had excellent results with the Dip Lube. Many commercial
firms purchase it in gallon lots for their bullets, so I know that it
works as well for their customers. Any lead bullets can produce
leading in some guns and with some loads, of course. I certainly do
not claim this product is the best lubricant made, but it is one of the
most convenient and easily used, especially with swaged bullets.
Before swaging the bullets, you may want to know how to put the
dies in the press. For the Hydro-press, you should have the book
"Power Swaging" at hand. You need it, period. Without it you will
break dies. For the Mity Mite, a brief reading of the instruction
sheet that comes with the press and dies should make the installation
and operation fairly clear. For the reloading press, ditto.
But here's a quick run-down: the Mity Mite die goes into the ram
of the Mity Mite press. The ram is the steel cylinder that moves in
and out of the press frame when you pull on the handle. It has a 5/8-
24 TPI thread in the working end, and the handle forks attached to the
other end.
There are two punches with the die (each and every die has two
punches that are required to operate it, except for draw dies). Lead
tip dies come with one punch, but use your existing point forming die
bottom punch. We are not going to be using those dies now. The
reloading press has an internal punch captive inside the black,
threaded adapter body. It's external punch slips into the press ram,
and the die screws into the pressd head like any reloading press die.
In the reloading press, you would be using the CS-1-R core seating
die, and you would have the hollow base internal punch inside the die.
If you wanted to install this punch (because the die normally comes
with a flat base internal punch, and you order the other base shapes as
optional punches), you would unscrew the die insert from the bottom of
the die and then pull the original flat base punch straight out of the
top of the die insert. You would clean the new punch, and press it
gently into the top of the die insert, then screw the die and punch
together back into the adapter body.
In the Mity Mite press, you would see that the die has threads on
one end and a venturi (funnel-shaped) opening at the other end. This
venturi opening helps align the external punch. The threaded end
should have a steel cylinder with two diameters protruding from it.
This is the head and tail of the internal punch. The tail is about
0.312 inches in diameter, and the head (right next to it) is about 0.50
inches in diameter. The rest of the punch is the same size, minus a
tad, as the die bore. It is a diamond-lapped sliding fit.
If you want to change the base shape, you slide this punch out of
the die, clean the new one carefully of all grit and dust, and slide it
carefully into the die from the threaded end. Flat base, cup base,
hollow base, and dish base shapes can all be made this way. Bevel base
can be simulated but remember that all end shapes which are formed by
pressing against a punch will have some degree of shoulder or step
where the edge of the punch contacts the bullet. A true bevel base is
not made in this simple kind of die.
Screw the die into the press by hand. In the Mity Mite, screw it
in all the way. Don't use tools. Hand-tight is tight enough. Don't
confuse the swage die, which is about 3/4-inch in diameter, with the
black threaded floating punch holder (FPH-1-M) in the press head! Many
people think the punch holder is the die, because it looks like a
reloading press die.
The external punch is held in the punch holder. In a previous
chapter this was covered with photos and detailed description. The hex
bushing unscrews from the end of the FPH-1. Inside is a collar or
bushing that slips over the punch. (If the punch is smaller than .375
diameter -- if not, the punch already has the bushing and hex bushing
assembled to it. Just remove the one in the FPH-1 and set it aside,
take out the round rocker bushing but leave in the solid rocker
button. Install the punch as one unit.)
Assemble the round rocker bushing and then the hex bushing over
the external punch. If you have any doubt as to what part is the
external punch, look for the one part that does NOT fit into the die
full length so that it comes to the mouth of the die and fills it
completely from end to end with some left over!
The die is the round steel cylinder with the hole through it. You
can see through it if you pull out the internal punch. The internal
punch will NOT fit into the floating punch holder properly. It has a
tail section that keeps it from fitting. The head of the internal punch
and the head of the external punch are the same diameter, but the
external punch has no projection or tail section. It steps down from
the head (about .50 inches diameter) to the shank (about 0.36 inches
diameter) to a section that is just below bullet diameter, having a
portion that is closely fitted to the die bore.
The punch should be held finger-tight in the floating punch holder
at this point. The adjustment of the punch holder is made by putting
one of the lubricated cores into the die mouth, and carefully moving
the ram forward so that the external punch can be aligned with the die
and moved into it. The object now is to adjust the punch holder so
that the press handle can be moved to the point where the die is
forward as far as it can go. If the punch and holder stops the ram
from going forward now, back off the punch holder. If the punch
doesn't contact anything yet, that's fine. Just get it into the die.
Make sure that the ram is capable of going as far forward as
possible, unlimited by coming against the punch or holder. No pressure
should be generated, no particular force required. The weight of the
handle should be more than sufficient to move the ram forward all the
way. Have you got that adjustment made? Make sure the ram is free to
move back and forth on both sides of its foremost extension. You can
tell if it is right, because the pivot pin that holds the ram to the
press handle will line up on the same plane as the bolt that holds the
handle to the two links.
Now, holding the handle so that the ram is at the furthest
position forward, screw the floating punch holder toward the ram. Keep
turning it by hand until the punch contacts your lead core and you can
no longer turn the punch holder by hand. If, at this point, you are
able to screw the punch completely into the die and the die face comes
up against the hex bushing on the punch holder, something is not right.
The possibility is that you didn't have enough lead core for the
set the way it is. The cure is to obtain a hardened steel bushing to
slip over the tail of the internal punch, extending it forward. Do NOT
try to machine or modify the external punch or die to cure thholder by hand. If, at this point, you are
able to screw the punch completely into the die and the die face comes
up against the hex bushing on the punch holder, something is not right.
The possibility is that you didn't have enough lead core for the
set the way it is. The cure is to obtain a hardened steel bushing to
slip over the tail of the internal punch, extending it forward. Do NOT
try to machine or modify the external punch or die to cure thward again.
Did any lead come out the bleed holes in the side of the LSWC-1 die?
Or, did you feel a rather sudden increase in the resistance in the CS-1
die? Back off the ram, eject the bullet, and see if it is nicely
filled out. See if it stays in the die, or if it comes back out with
the punch.
Normally, the bullet will stay in the die even if it is somewhat
undersized at this point. Jacketed bullets often come out with the
external punch until enough pressure has been applied to expand them to
die diameter. When you run the ram all the way back, the internal
punch comes up against the stop pin in the back of the press and pushes
the bullet out by holding the internal punch still while the die
continues to move back with the ram.
If the bullet is poorly formed, adjust the punch holder a fraction
of a turn forward and try another core. When you get it right, the
bullet will be properly formed and will measure the correct diameter
from one end to the other. The internal punch will have formed a deep
hollow cavity and the external punch will have transferred its nose
shape to the end of the bullet (in this case, a wadcutter nose).
If you have voids or unfilled edges on the bullet, then you might
have a bit too much lube. Wipe the lube off the external punch and try
another core without so much lube applied. If that still doesn't come
out well, adjust the punch holder slightly forward again. But do NOT
keep adjusting the holder forward until you feel an extreme resistance.
One hand force is all you should ever need to apply. If it feels like
you should be using both hands, something is wrong and you may be on
the verge of breaking your die. Stop and find out what is wrong.
If the lead is too hard, this can be a serious problem. Hard lead
does not flow or swage very well. Soft lead swages very nicely. The
pressure required to swage even a 3% antimonial alloy of lead is at
least double that of pure lead. When you first start, it may be hard
to judge how much pressure is enough. The press is so powerful that a
very light pressure on the handle produces a very great force on the
ram. With calibers in the .375-inch range and up, you can break the
die without seeming to apply undue effort, so be careful to stop
applying force or adjusting the punch holder forward as soon as you
reach the point where the bullet begins to form nicely.
With a little pressure on the ram, while swaging a bullet, cinch
the hex bushing on the punch holder up snugly by hand. This keeps the
punch aligned with the die, so you don't have to do more than check it
from time to time. Swage all your bullets with the punch holder set at
this position and the locking nut secured against the face of the press
head. If you want to repeat this setting soon, lock down the set screw
on the punch holder. Having several punch holders gives you quick
repeatability by leaving each punch in its own holder with pre-set lock
nut.
Now, back to the reloading press. The adjustment is exactly the
same, except that you put the external punch in the slotted ram, and
adjust the die downward toward the punch, while the punch is raised to
the topmost position of the ram. It is important that you realize that
the furthest extension of the ram is what controls consistent results.
If you swage by feel entirely, you may get widely changing weights.
Use feel to judge whether or not a core is a great deal lighter or
heavier as you approach the top of the stroke.
Do NOT continue to press if you meet resistance before you
normally did on similar bullets during a run. You will probably swage
a heavier than usual bullet, at best, and at worst you may break the
die or mash the punch flat. Set aside any cores that either developed
less or more resistance to swaging than your usual bullet during any
given run. Those are light or heavy cores. They can be used for some
other weight, or melted down for a cast core.
We have covered a lot of elementary material here. Refer to this
basic bullet and adjustment procedure for just about any other die.
The concept is the same: approach the right adjustment from the loose
side, where you have no pressure, and increase it in small bits until
you achieve the desired result without exceeding moderate efforts on
the handle. It is a lot like experimenting with a new powder charge:
build the load in small increments and watch for signs of pressure.
Here we are dealing with pressures that could destroy a rifle when they
are normal. But they don't contain much total energy, so no parts fly
around when a die breaks. You hear a crack, and you see one in the
die. That's about it. With just reasonable care, you'll never know
what a broken die sounds like.
For the rest of the bullet styles, I will give only a brief
description of the process, detailing only the unusual aspects of
making the bullet. Please remember the basic rules: swage dies
increase diameter, never reduce it. Lubricant is required for every
swaging operation (I won't keep mentioning it). The punch must fit
easily into the die, or it is the wrong one to use. The force you feel
should on the handle should be mild, never requiring double-handed
effort. And while you can experiment, do get a good understanding of
the basic operations for each die first.
HOLLOW POINT JACKETED HANDGUN BULLETS
The hollow point is made during core seating. Instead of using a
flat faced punch to push the core into the jacket (in the core seating
die), you need to order the optional hollow point external punch. This
punch has a conical probe on the face, which presses down into the lead
core and forms a cavity at the same time that the lead is pressurized
to move the jacket walls out and meet the die.
A more uniform hollow point can be made if you first seat the lead
core with a flat punch, then change to a hollow point to form the
cavity. This step is for the perfectionist, and may be unnecessary
even then, depending on how deep the lead seats in the jacket and other
factors.
In any press, this operation takes place as a result of using a
hollow point punch during the core seating operation. The dies
themselves are the same, regardless of whether you select a hollow
point or a soft point, an open tip or a full jacket. In a single core
seating die, for making semi-wadcutter or wadcutter hollow points, you
can use the HP punch either before or after using another nose punch.
The key to successful use of more than one punch on the same
bullet is to realize that you do not have to press the punch all the
way into the die. Using a portion of the possible extension into the
die and lead gives you almost total control of how deep and how big the
cavity will be. Whether you swage the HP first or use another punch,
such as a Keith nose punch, first, determines the cavity size and the
shape of the bullet.
A Keith punch and a hollow point punch can produce a wide range of
shapes, including a simulated round nose! Experiment with various
insertion depths. In other words, adjust one punch to go in further
and the other one to stop short of going in all the way. Using both to
the full extent possible only means that the bullet will be primarily
formed by the last punch you press against the lead. Whichever punch
is pushed in hardest and further against the lead is the one that gives
the bullet most of its final shape.
If you use a point forming die, then of course you do not need to
experiment with semi-wadcutter nose punches. The point forming die
will shape up the ogive for you. It will also smoothly close the
hollow point to a more long and narrow shape, depending on how far into
the point forming die you wish to push the bullet. If you adjust the
press and die so that you just barely push the bullet into the point
forming die, then you will have a very large hollow point.
On the other hand, if you push the bullet into the die as far and
as hard as you reasonably can, you may well close the hollow point
completely. This can produce an unusual result: you can fill the
hollow point cavity with a fluid or powder, or a steel ball, and then
cause the end of the bullet to roll over this material and trap it in
the cavity. If the hollow point is much deeper than the ogive length,
a good portion of the cavity will remain at its original size while the
part toward the end of the bullet becomes more narrow.
This means you can make hollow point
completely. This can produce an unusual result: you can fill the
hollow point cavity with a fluid or powder, or a steel ball, and then
cause the end of the bullet to roll over this material and trap it in
the cavity. If the hollow point is much deeper than the ogive length,
a good portion of the cavity will remain at its original size while the
part toward the end of the bullet becomes more narrow.
This means you can make th
your more experimental designs.
BOATTAIL HANDGUN BULLETS
With a long shanked rifle-style bullet, a special set of dies is
required to manufacture a good boattail base. At Corbin, we make the
rebated boattail base, popularized by the fine Lapua match bullets.
But in a short, stubby handgun bullet, it is easy to make a rebated or
a regular boattail using only a special punch (and not really all that
special).
Usually, it's necessary to seat a lead core in the jacket using a
core seating die. The die is sealed on both ends by punches, so
pressure can be built up inside the jacket to expand it like a balloon.
If you turn the jacket over so the closed end is toward to top of the
cavity in a point forming die, then you can apply a fair amount of
pressure inside the jacket with an external punch that fits down into
the jacket. The fit must be close, to keep the pressure from extruding
lead around the punch. But it is practical and works well.
If you put a core inside a handgun jacket, then use a punch
(ordered as an open tip core seating external punch) that fits into the
jacket to press against the core, and put the assembly into your point
forming die (base first), you will produce a full jacket, open base
handgun bullet.
Should you have a truncated conical point forming die, rather than
a round nose shape, you will actually have what could be considered
either a nose or a boattail base! To use it as a base, eject the
bullet and change the external punch to a regular Keith nose punch that
fits into the point forming die by hand. (Remember, in your
experiments, to try each punch by hand first -- you don't want to fit
the punch to the die permanently!)
Now, with the Keith nose punch installed in die, rather than
a round nose shape, you will actually have what could be considered
either a nose or a boattail base! To use it as a base, eject the
bullet and change the external punch to a regular Keith nose punch that
fits into the point forming die by hand. (Remember, in your
experiments, to try each punch by hand first -- you don't want to fit
the punch to the die permanently!)
Now, with the Keith nose punch installed in point
(depending on how much lead you moved forward) TC nose, a short shank,
and a rebated boattail base -- what a combination! But give it a try.
You can load it either direction. I like to make these bullets with
about one caliber length of straight shank. That usually means a
bullet with one of the longer jackets and toward the heavier end of the
weight scale. But as you can see from some of the tests in the
magazines (one of which is reproduced in the Corbin Technical
Bulletins) this design can result in a 40% improvement in ballistic
coefficient and as good or better accuracy than conventional shapes!
SHOTGUN SLUGS WITH ATTACHED BASE WADS
This is a task for the Hydro-press system. There are many
possible kinds of highly accurate slugs you can produce. One is a slug
that fits inside the Winchester Red Wad, and is thus made slightly
under normal diameter to use the sabot effect of the standard plastic
wad. Another is the slug with wad attached to it. This operation is
quite simple. A die set can even be produced to stamp out excellent
wads from various materials. The details of operating the press are in
the book "Power Swaging".
I will just outline the process here. The wad is made with a hole
through the center. The hole is precisely centered as a result of the
die-forming process. The pre-swaged core and wad are put into a die
with a nose cavity punch in the die, and a base punch having a slight
depression in the face, like a smooth rivet head, follows the wad into
the swage die. A core seating or lead semi-wadcutter type die is used.
As pressure is applied, the lead flows up into the nose punch
cavity and forms any desired shape of nose. Usually a conical flat tip
or a domed shape is made. The lead also presses hard against the wad,
and finds a pressure escape through the hole in the middle of the wad.
The lead flows through this hole, and fills the cavity in the head of
the punch that is backing up the wad.
The wad is compressed under tons of pressure, and so is the lead.
The lead extrusion through the hole in the wad forms a perfect rivet
head on the other side of the hole. When the bullet is ejected, you
have a lead slug firmly attached to the wad, which now tries to spring
back to original size and keeps pressure on the base of the slug.
Another unique twist on this is to form a hollow base cavity with
a post in the middle, and with a hole in the middle of the post that
will take the threads of a number six or eight metal screw. It might
seem very complex, but in reality all you have to do is imagine a punch
having a mirror image of this cavity and post and hole formed into the
steel face. The reamer and polishing work required is, of course,
somewhat expensive. But it is well within reason for anyone who wishes
to manufacture a unique kind of slug.
The idea is to shift the weight forward, maintain a longer bearing
surface for alignment, without having a massive weight, and provide
solid support in the middle of the cavity so that the wad is not blown
into the cavity upon firing. The screw attaches the wad to the post.
It might even be possible to fill the cavity with cornstarch and then
swage the wad to the slug, but this has not yet been tried (maybe by
the time this book has been out a year, it will be common).
PRECISION AIRGUN PELLETS
Airgun pellets are really no different from any other hollow base
semi-wadcutter bullet. The dies have smaller punches and cavities than
most calibers. Corbin makes .20, .14, .17, .224, or anything else you
like. Diameter is critical. Rather than the waisted design, these are
like a precision handgun bullet in minature.
They have a deep hollow cavity and thin skirts to give a good
seal, and they usually are made slightly smaller than a waisted pellet
so that the bore friction is reduced. Swaged with a Dip Lube coating,
they provide good lubrication that is consistent and dry in all
temperatures. The nose can be conical or of the Keith style with
equally good results. Such pellets in .2235" diameter make excellent
indoor practice bullets or mouse shooters in a conventional centerfire
rifle used with a primer only.
There are complex ways to swage the waisted pellet, but it isn't
usually worth the effort compared to the results you get with the
simple single die method in either reloading press or Mity Mite. In
the reloading press, only a .22 pellet is offered, unless a run of at
least 100 dies is ordered (for resale). But in the Mity Mite, you can
have anything you wish.
PLASTIC TIP RIFLE BULLETS
Several of the common plastic rod materials swage nicely to form
lead tip replacements in any conventional rifle caliber. Nylon,
polyethylene, and other "soft" plastics that can be shaped by pressure
and retain that shape after pressure is removed make nice tips for your
hunting bullets. The idea of the plastic tip predates the current
Nosler design by many years, as seen in the early Norma nylon tips and
in home-swaged bullets using Nylon tubeless tire patches (plugs) in
stark black or white.
The FBI once contacted Corbin about making Nylon bullets for
handgun use in an indoor training facility. The idea came about
because a conventional Speer Nylon bullet had a sharp shoulder that
prevented the use of speed loaders. When these bullets were re-swaged
in a simple Corbin point forming die, right off the shelf, they
acquired a more bullet-like profile and worked in the conventional
speed loader.
A side benefit turned out to be that the agency could reload these
plastic bullets seemingly without end, after reswaging to remove the
rifling and other impact marks. I have one left in my collection that
was shot and reloaded and reswaged over 25 times, and it could still go
on without any apparent change.
Nylon rod can be obtained from most plastic suppliers. It can be
cut to short lengths in a lathe or bandsaw. The bullet is made in the
same way as any open tip design, by seating the lead down inside the
jacket with a punch which fits into the jacket. But before the point
is formed, the short piece of Nylon is placed inside the jacket. The
diameter should be close to the jacket ID.
When the point is formed the jacket and Nylon plug smoothly swage
into one profile. The ogive locks the plastic in place (it crimps into
the material since the plug is larger inside than at the external tip).
FRAGMENTING BULLETS
Bullet swagers have been making their own fragmenting defense
bullets for years. It is extremely simple. Just dipper a charge of
number twelve lead shot into a jacket, and seat the shot like it was a
solid core. Press a bit of soft wax or a thin cardboard wad over the
shot. A wad can be made in a regular swage die of smaller caliber by
putting a bit of cardboard between the punch and die and pushing
through it.
Then, form the ogive in a point forming die. To increase the
fragmenting effect, first roll or tumble a quantity of shot with a
little dab of Corbin Swage Lube. This lube keeps the shot from
sticking together -- it may appear solid when you swage it, but on
impact it break up nicely.
HYPERSPEED BULLETS
What would you call a bullet that goes 2000 fps from a snubby .38
Special? Impossible? No, you can develop an ultra-light bullet in any
caliber and then find a fast-burning charge of the right powder to
propel it at unbelievable speed. Some of the effects are dazzling.
Here is how you retain enough bearing for a semblence of accuracy
and still keep the bullet weight down: use cornstarch as a core!
The secret is out...but only bullet swagers know about it.
Cornstarch swages under high pressure to form a sort of hard plastic
material that is much lighter than any conventional jacket filling, yet
expands the jacket as well as lead under swaging pressures.
Because of the low density of the material, even when swaged to a
plastic state, you can make a regular length bullet that seats and
balances as it should, yet has very low inertia. The sectional density
is very low, which means it doesn't penetrate very far and it also
doesn't fly very far before losing its speed. Those can be good
features in a defense bullet used in populated areas.
When you top the cornstarch with a small amount of lead, you can
produce a method of delivering a devastating high velocity projectile
without nearly as much danger to people behind the intended target.
Make the filling out of swaged lead shot of small diameter, rolled with
Corbin Swage Lube, and you have just produced a superior fragmenting
bullet with ultra-high velocity. You need nothing special to do all
this, except the right punch to fit into the jacket at the depth where
you want to swage the material.
PARTITION STYLE HANDGUN OR RIFLE BULLETS
Putting a partition across the middle of a bullet is as easy as
telescoping two different diameters of jackets together. This is
covered in some detail in the book "Rediscover Swaging". Basically,
the inside jacket is of smaller caliber and is about half the length of
the outside jacket. When jackets do not exist ready-made to fit this
way, a Corbin JRD-1 draw die can turn some available jacket into the
right size.
In the Hydro-press system, it is possible to make partitions by
folding and pressure-welding the actual jacket wall material into a
band across the jacket at any desired point. Copper tubing is normally
selected, so you have both the benefit of the soft copper tubing and
the partition effect. If you want to go one further, add Corbin Core
Bond and a little heat, and you have a bonded core, partitioned, copper
tube bullet -- something none of the famous firms who are known for
making one of these features apiece have managed to combine.
PENETRATOR CORE OR LIQUID FILLED CAVITY BULLETS
I group these two styles because they are made the same way. A
set of special punches is made to seat a very light core in the bottom
of the jacket. One punch seats the core, and the other puts a center
in the core. Then a long hollow point punch slips down into the
jacket, finds the center, and starts extruding lead up along the punch
sides. Plenty of good lube is required on the punch.
The punch is withdrawn, leaving a long, deep cavity precisely
centered in a lead sheath inside the jacket. A carbide, uranium or
other heavy metal core can be placed in this cavity. It works best if
the insert material is slightly larger than the cavity for a gentle
press fit. A punch can also be made to do this.
Corbin does not provide these heavy metal cores. Most of the
people who do this work are able to obtain their own from defense
agencies or suppliers. Such bullets are usually made for special
projects within the military and are discussed here only to show the
possibilities. Liquid filling for the same cavity can easiy be
substituted. A lead ball is placed in the end of the cavity to help
seal it, and then the bullet is put into a point forming die and the
ogive shape extrudes lead over the widest part of the ball and locks
the assembly together.
ULTRA PRECISION BENCHREST RIFLE BULLETS
The quality of the bullets you can make in a typical Corbin swage
die for the Mity Mite or Hydro-press will equal or exceed that of any
bullet made today. You do not need to pay thousands of dollars for
special "benchrest" quality. The best quality that money can buy comes
far less dear than some folks imagine possible.
On the other hand, I do not recommend the die sets that we
manufacture for use in a reloading press as benchrest bullet dies.
They are good dies, and have often been used to make match-winning
bullets. But the system does not lend itself to what I would call the
ultimate control over the bullet weight and style.
Reloading press dies are made to work in a press that was not
designed specifically for bullet swaging. Corbin Mity Mite and Hydro-
press dies were designed along with the press, without having to
consider factors necessary for reloading. The Hydro-press and the Mega
Mite press both handle reloading as a side benefit, not as a primary
goal that might restrict optimum design for bullet making.
Alignment, sensitivity of control ("feel", if you like), balance
of the forces that tend to produce ram torque, amount of press head
movement under stress, maximum leverage potential, and other factors
from how ejection is handled to where the top of the ram comes to rest
in relation to the press head, are all optimized for bullet making the
the special swaging presses. These things simply are not there, in a
reloading press. It doesn't matter how big or strong or expensive the
press is: if it was made primarily for reloading ammo, it wasn't
optimized for making bullets.
I have had a few perverse clients shoot winning matches with
bullets made in our standard reloading press dies, and they enjoyed
telling their fellow shooters (who had spent thousands of dollars, in
some cases, for the "right" benchrest equipment) how little their
equipment cost (usually under $250 for everything -- dies alone cost
about $160). But while it can be done, I certainly feel that you are
better advised to use equipment made with all the benefits of the
special swaging press in mind.
There are two secrets to making benchrest bullets. First, the
jackets themselves must be very concentric and should be weighed so
that you can cull out any over or under a nominal value. Different
weight by itself has little effect on the bullet path, within a factor
of from 1 to 2 percent of the total bullet weight. (Calculate the drop
difference and you will see that one-hole groups at 100 yards are still
possible with bullets that weigh plus or minus half a grain in a 55
grain .224 caliber, or bullets that have 1.5 grain variation in a 150
grain .308 caliber).
The problem with weight variation is that it can be caused by a
thicker base, thicker walls, or even a difference in wall thickness
from one side to the other. If it is merely a bit longer jacket, it
won't have much effect. And the heavier or lighter jackets, by
themselves, do not cause bad groups. It is a mixture of different
jackets that can throw off the group size. A heavier or lighter wall
is not bad, it just can't be used with something different in a
benchrest match.
The next secret is consistency in the method of making the
bullets. The little rituals and weird theories about what makes a
bullet shoot are a lot of fun for the people who believe in them, and
even if they make little sense to rational people, I see no harm in
following the latest fad in regard to many of the rituals. But for a
person who is mainly interested in fact, and wants to see what really
does and does not make a difference, it doesn't take too long to see
that a machine rest in an indoor tunnel easily proves that consistency
makes more difference than any specific method.
In other words, whatever you do in regard to how you apply your
lubricant, whether or not you "rest" the cores overnight before
swaging, or whether or not you spin and weigh each bullet in some
questionable fixture or tool made to point up some mysterious accuracy
factor, the real effects will come from doing things the same way each
time, so all the bullets do indeed come out looking and shooting the
same way.
Some of these rituals help produce a more consistent bullet, often
for reasons not entirely related to the goal that the shooter feels he
is trying to reach by that ritual. Benchrest shooting originally
brought a great many serious benefits and pointed out errors in how
bullets were being made during the 1940's and 50's. To some extent, a
level of mystique and fraternalism has moved into the place that used
to be held by serious investigation, with the quirks of the latest
winner being slavishly repeated by next year's would-be winners.
But this is true in all competitive sports. Winning matches does
not necessarily make the shooter an expert on every aspect of the tools
and equipment used to win. Sometimes a good deal of winning is
attitude and practice, especially when equipment differences become
very slight at the top levels. All of this is merely to point out that
making benchrest quality bullets is not necessarily the exclusive realm
of a white-bearded wizzard who knows cosmic secrets which you, mere
mortal, can hardly be expected to understand.
As a matter of fact, nearly anyone with a reasonably good set of
dies and careful attention to what he is doing can turn out bullets
capable of one-hole groups. Then it is up to the rest of the system,
including the handload and the gun, the shooter and the fates that blow
the winds, to let that one-hole group appear on any given day.
This information doesn't play well with those who would like to
have you believe there are dark secrets beyond your reach, which only
certain people (who happen to have something they might -- hold your
breath! -- be persuaded to sell you) have in their posession. But you
can prove it to yourself, and to anyone else who doesn't have too big a
stake in keeping it quiet! There is no fundamental difference in the
potential quality of a .458 bullet, a .600 Nitro bullet, or a .224
benchrest bullet made by the process of swaging outlined here.
All swaged bullets made by hand on good equipment, using
consistent components, can be made carefully and well. They can all be
benchrest bullets of their caliber. A heavy recoiling .458 isn't
likely to produce as tight a group as a conventional .224 short case
benchrest cartridge using specially selected primers, but if you
compare similar kinds of guns and loads, you will soon see that your
own home-built bullets stack up in the same way as benchrest .224
bullets stack up against the average factory offering.
You have nothing to fear in the accuracy department, in regard to
the dies or the bullets you can make, given the material and care
necessary. Do not, however, make the error of assuming that a perfect
bullet will turn an average rifle into a benchrest gun. It will not.
The errors caused by poor bedding, a light barrel, gas cutting in the
throat or leade, improper powder charges, or even a less than steady
shooter, will completely overwhelm the slight errors produced by a
bullet of average quality. No difference between a perfect bullet and
an average one could be told with most of the guns that are capable of
being carried afield, if the load is right and the shooter does his
part.
A good discussion of accuracy and bullet design can be found the
the textbook, "Rediscover Swaging". The techniques for obtaining
greater than usual core weight consistency and proper core seating
are also discussed in this book. Multiple passes at core swaging,
holding the pressure for a consistent length of time, application of a
precision film of lube rather than the usual transfer of lube with the
fingers, and other factors that increase the consistency of results are
discussed.
.he CHAPTER 8 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
BOOKS FOR BULLET SWAGERS
Learn about bullet swaging, the fast accurate process that gives
you total control over bullet design and production! The combined
knowledge of generations of master die-makers has been collected in the
Corbin Swaging Library -- seven volumes of easy-to-read, fact-filled
information. More than 840 pages of authorative work, with charts,
photos, data, drawings, and technical reports, in a special package to
save you money!
USE YOUR VISA/MASTER-CHARGE AND ORDER BY TELEPHONE: 503-826-5211
The Corbin Swaging Library includes these books:
The BULLET SWAGE MANUAL, T.Smith
The CORBIN TECHNICAL BULLETINS, Vol. I
The CORBIN TECHNICAL BULLETINS, Vol. II
The CORBIN TECHNICAL BULLETINS, Vol. III
POWER SWAGING, D. Corbin
RE-DISCOVER SWAGING, D. Corbin
The CORBIN HANDBOOK & CATALOG of BULLET SWAGING
Order catalog number BP-7
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The BULLET SWAGE MANUAL, T. Smith, 1976, 45 pgs.
This book is one of the earliest works on bullet swaging, written
by a pioneer in the field. Many of the illustrations are of early
Corbin swaging tools. The book is intended as a primer for beginners,
but belongs in any complete library of swaging as a historical work.
Catalog number BSM
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The CORBIN TECHNICAL BULLETINS, Volume I 1977, 66 pgs.
The first collection of Corbin technical papers, this book
contains a detailed section of definitions, specific questions and
answers about swaging technique, comparisons of cost, speed and
accuracy between casting and swaging, and answers to the most commonly
asked questions about bullet swaging. Rimfire jacket-making, hollow
and cup points, designs for deep penetration, and other similar
subjects are covered.
Catalog number TB-1
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The CORBIN TECHNICAL BULLETINS, Volume II 1980, 102 pgs.
This book gives a detailed chapter by chapter discussion of
specific calibers and how to make bullets for them. Included are
obsolete, foreign, current centerfire rifle and handgun calibers, in
fifteen chapters. In addition, there is an experimental .375 design
with loading data, chamber dimensions, and test results. A wealth of
information about the history of swaging is included.
Catalog number TB-2
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The CORBIN TECHNICAL BULLETINS, Volume III 1983, 106 pgs.
Experimental work with custom bullets, the rise of the survivalist
movements, and concerns about the future supplies of bullets in the US
and abroad brought a flood of technical articles addressing these
subjects. Original papers and translations from trade journals are
included. Bonding and heat treatment of jackets, manufacture of copper
tubing bullets, and hunting bullets are covered in detail.
Catalog number TB-3
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POWER SWAGING, D. Corbin 1984, 195 pgs.
Also known as Corbin Technical Bulletins, Volume IV, this is the
bible of commercial bullet making. It is filled with data on pressures,
forces, and die strength, calculations, charts, computer programs, and
photos. Hundreds of dollars worth of dies were destroyed to test the
limits of the formulae, and photos of these are included as well.
The book serves as an operator's guide for the Hydro-press,
although it also covers several earlier models of air and hydraulic
power presses that are no longer manufactured. Two very valuable
chapters deal with organization of a custom bullet business, and with
the numbers involved in production volume. Marketing, promotion,
feasibility studies, and selection of a product line are written so
they can be understood by a beginner, yet interesting enough to attract
experienced engineers.
Catalog number TB-4
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RE-DISCOVER SWAGING, D. Corbin 1983, 244 pgs.
This is the standard textbook of swaging. The washable morroco
cover is gold-embossed. It is used by law enforcement agencies and
schools around the world, in public and private libraries from Brussels
to Perth, read by the Royal Canadian Mounted Police and by the students
at gunsmithing schools. You'll find detailed, accurate information
arranged in twenty-two chapters, covering everything from lubricant to
lead, pressure to press design, history of swaging (including original
letters from Biehler and Astles, Fred Huntington, and Capt. G.L.
Wotkyns at critical points during the 1940 to 1960 period) and just
about anything else you might care to know about swaging. If you only
want one book, make it this one.
Catalog number RDS
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The WORLD DIRECTORY of CUSTOM BULLET MAKERS
Data has been collected from all over the world for a decade on
bullet markets, and the people who are active in the custom bullet
field. If you are looking for a certain caliber -- modern, obsolete,
wildcat, foreign, or experimental -- this is the sourcebook for people
who can make it! Articles of interest to experimenters, purchasing
agents, engineers, and ballisticians as well as those who might wish to
enter the custom bullet field as suppliers are included.
Editors, writers, and publishers of firearms journals around the
world have a copy of this book for reference. Buyers in government and
industry, defense agencies and law enforcement operations, game control
commissions, ballistic labs, and applied science libraries can turn to
the sources listed to find out who makes what.
Corbin customers who are selling bullets commercially are invited
to write for a free listing in the book's next edition. Advertising
space is periodically available to qualified firms. Agencies dealing
with firearms-related suppliers should check out the tremendous market
exposure this book gives.
Catalog Number WD-1
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The CORBIN HANDBOOK and CATALOG of BULLET SWAGING, No. 7
You are reading a copy now! If you would like additional copies
for friends, order directly from Corbin. This is the seventh edition:
it is not the seventh book of the collection, or the seventh year,
since Corbin has been in business much longer than that. We publish a
new edition whenever the information becomes outmoded and continued
editions of the same book begin to lose their relevance to newer ideas.
Catalog number HB-7
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OTHER LITERATURE...
The BASICS of BULLET SWAGING
This is a color brochure, 6-pages, telling what swaging is and
what you can do with it. Single copies are available postpaid for $1
(to cover postage and handling). Write for quantity prices to clubs
and schools.
The Corbin HYDRO-PRESS brochure
A color folder describing the powerful CHP-1 Hydro-press. Single
copies are $1 (for postage and handling) -- no additional charge if
ordered with other literature. Write for quantity prices to clubs and
schools.
The Corbin IMMEDIATE DELIVERY LIST
This is a list of dies available for immediate delivery. Since
Corbin dies are all hand-made products, individually diamond lapped and
fitted, there can be a considerable backlog on certain calibers from
time to time. The Immediate Delivery List tells what is on the shelf
right now. It changes from month to month, and is not a guarentee but
only a temporary listing. If you see something you want, call
immediately and use your VISA/MASTER-CHARGE card to have it shipped
right away. (Sorry - no holding for future payment! Demand is just
too high to tie up products in this manner.)
This list is free for the asking, when ordered with other
literature or products. Included with most shipments is also our
current price list, any specials we may have on supplies or products,
announcements of new books or computer software, etc.
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CORBIN COMPUTER SOFTWARE
Now you can design bullets quickly, easily, with Corbin's DC-1001
Bullet Design program. All you need to know is the weight and style of
bullet you want to make -- the program asks these simple questions, and
then calculates the ballistic coefficient, form factor, average
density, stable twist rate, core and jacket volumes, core weight, over-
all length, length of ogive and length of shank, and a number of other
parameters of importance to makers of commercial bullets.
If you don't know what to answer, the program supplies a standard
default value. You can just hit the "enter" key, and run the
calculation automatically with all default values if you wish, to see
how it works. You need absolutely NO math background, NO experience in
bullet design or ballistics. Automatic tables appear on the screen for
each question that requires some special knowledge, and the program
checks your input to see if it is reasonable. If not, it gives you
another chance to input a value, or just hit return and let the program
supply a value.
There is no way you can "mess up" this program. And best of all,
when you have designed the bullet (which takes perhaps two seconds),
those values can be printed out, and/or automatically used in a second
program that is part of the first one: kinetic parameters. You can
"fire" the bullet at any velocity within reason, see what kind of
energy density, muzzle energy, momentum, and other values the bullet
would have. And, you can change one or more parameters and try it
again to see the effect, all within seconds. The program keeps all the
values you put in last, and uses them until you change them. If you
turn off the program, it resets to standard default values so you
can't "get lost" or forget important standard values.
The DC-1001 program is currently available on 5-1/4" floppy disk
for IBM-PC/XT or /AT computers. The program is completely self-
contained in executable machine code for the 8088 processor, and runs
at either 4.77 mhz or at accelerated clock rates. Either color or B&W
monitors will work. All display is in the text mode. The disk is NOT
copy protected and can be loaded onto your hard disk drive.
Don't confuse DC-1001 with ordinary external ballistics programs:
it is not merely an electronic table of values, but a powerful
calculus-based tool for design of bullets. It is not the same as a
program that gives you drop and remaining energy for an existing
bullet, but a way to create new bullets of your own design. You can
input various densities of core and jacket material, and find out what
effect aluminum, tungsten, brass, or plastic might have on the bullet
paramters. You can even select the target material density and find
out what spin rate would stabilize the bullet in space, in air, under
water, or in any other media. DC-1001 is a one-of-a-kind program for
the bullet maker. (To run the program, simply type "Bullets").
Catalog Number DC-1001
-----------------------------------------------------------------------.he CHAPTER 9 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
KITS for your RELOADING PRESS
The easiest way to get started is to purchase a complete kit, with
everything you need to start making your own private "brand" of
bullets! Here are several kits that you can put together yourself.
Just specify the caliber, and order however many bullet jackets and
other supplies you may want. I've made suggestions for reasonable
amounts of supplies with each kit...
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ECONOMY .224 KIT
Order these items to make up your own minimal cost kit, for making
excellent quality .224 caliber bullets (.221, .222, 5.56mm, and .220
Swift as well as every other centerfire .22 made today uses a .224"
bullet). The equipment listed can produce jacketed bullets using fired
.22 long rifle or short cases in the weight range of 45 to 60 grains,
with a 6-caliber spitzer ogive and a flat base. (No boattails, other
ogives, or special work in the reloading press series -- rather defeats
the whole reason for it, since these extras would bring the cost more
in line with the Mity Mite system, and then you would be far ahead to
get a Mity Mite!)
BSD-224R Core Seater and Point Former, 2-die set
RFJM-22R Rimfire Jacket Maker, 224 caliber
CSL-2 Corbin Swage Lube, 2-ounce bottle
CM-4 Corbin 4-cavity adjustable core mould (specify 224)
If you prefer the speed of cutting lead wire to the slightly
lower cost of cast cores, you might prefer this package instead:
BSD-224R Core Seater and Point Former, 2-die set
RFJM-22R Rimfire Jacket Maker, 224 caliber
CSL-2 Corbin Swage Lube, 2-ounce bottle
PCS-1 Corbin Precision Core Cutter
LW-25 Lead Wire, 25-lb. spool (specify 224)
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DELUXE .224 KIT
A faster, easier system includes the power ejector unit and a hand
cannelure tool, plus a supply of commercial drawn jackets for high
precision benchrest work. I personally like this because it gives a
good chance to compare your own free jackets with the best commercial
ones made today.
BSD-224R Core Seater and Point Former, 2-die set
RFJM-22R Rimfire Jacket Maker, 224 caliber
CSL-2 Corbin Swage Lube, 2-ounce bottle
CM-4 Corbin 4-cavity adjustable core mould (specify 22 cal)
LW-25 Lead wire, 25 lb. (specify .185" -- 22 caliber)
PCS-1 Corbin Precision Core Cutter
J-22-705 Jackets, 224 caliber, .705-length, box of 500
HCT-1 Corbin Hand Cannelure Tool
PE-1 Corbin Power Ejector Unit
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ECONOMY .243 KIT
If you want to make 6mm bullets (.243 -.244 caliber) from fired
.22 cases, then this is the right kit for you:
BSD-243R Core Seater and Point Former, 2-die set
RFJM-6MR Rimfire Jacket Maker, 6mm from 22LR
CSL-2 Corbin Swage Lube, 2-ounce bottle
CM-4 Corbin 4-cavity adjustable core mould (specify 6mm)
* Note: the 6mm and .224 both use the same .185 core --
You can use the same core mould for both.
Or, you might consider replacing the CM-4 mould with a lead wire
cutter and a spool of lead wire, for safer, faster bullet-making.
If you wish to use commercial jackets, leave out the RFJM-6M and
instead, order the following jackets:
J-6M-750 Jackets, 6mm, .750-inch length, box of 500
J-6M-825 Jackets, 6mm, .825-inch length, box of 500
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DELUXE 243 KIT
You can put together a nice kit that would also be my personal
choice for making .243 bullets in the reloading press by ordering the
following items:
BSD-243R Core Seater and Point Former, 2-die set
RFJM-6MR Rimfire Jacket Maker, .22 LR to 6mm
LW-25 Lead wire, 25 lb. spool. (specify 6mm)
PCS-1 Corbin Precision Core Cutter
CM-4 Corbin 4-cavity adjustable core mould (specify 6mm)
CSL-2 Corbin Swage Lube, 2-ounce bottle
PE-1 Corbin Power Ejector Unit
HCT-1 Corbin Hand Cannelure Tool
J-6M-750 Jackets, 6mm, .750-inch length, box of 500
J-6M-825 Jackets, 6mm, .825-inch length, box of 500
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.25 RIFLE KIT
We've not advertised the .257 rifle dies for reloading press for a
number of deep, dark reasons: primarily, we didn't want to get too far
behind. But now, with our new die-works going full-blast, it's time to
let you know that we have .257 caliber dies developed for the reloading
press in a flat base, 6-caliber spitzer design similar to our .224 and-----------------------------------------------------------------
.25 RIFLE KIT
We've not advertised the .257 rifle dies for reloading press for a
number of deep, dark reasons: primarily, we didn't want to get too far
behind. But now, with our new die-works going full-blast, it's time to
let you know that we have .257 caliber dies developed for the reloading
press in a flat base, 6-caliber spitzer design similar to our .224 andkets in stock.
Here is a potential group of kits you could put together to use
either 6mm jackets or drawn 7mm jackets (or, when available, regular
.257 jackets):
BSD-257R Core Seater and Point Former, 2-die set
CSL-2 Corbin Swage Lube
CM-4 Corbin 4-cavity adjustable core mould (specify 257 cal.)
J-6M-825 Jackets, 6mm caliber, .825-inch length, box of 500
Or, you could go the deluxe route, and add the convenience of a
power ejector and the ability to install precision cannelure grooves,
the speed of cutting lead wire, and the ability to use 7mm jackets by
adding these items to the above list:
PE-1 Corbin Power Ejector Unit
HCT-1 Corbin Hand Cannelure Tool
LW-25 Lead Wire, 25-lb spool. (Specify .257 caliber)
PCS-1 Corbin Precision Core Cutter
JRD-1-R Corbin Jacket Reducing Die (Specify 7mm to .257 cal.)
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HANDGUN CALIBER KITS for RELOADING PRESS
In the handgun calibers, we offer these calibers:
.25 ACP .30 Mauser/Luger .32 ACP .32 S&W Long
.32 H&R .30 Carbine .380 ACP .32 Colt
.38 S&W .38 Long Colt .357 Maximum 9mm Browning
.38 Special .357 Magnum .32-20 WCF
For those of you who know the score, many of the above calibers
are actually the same diameter, such as .380 ACP and 9mm, .38 Special
and .357 Magnum. Thus, you can make several calibers with the same set
of dies, if you know what diameter each caliber is supposed to be.
This is covered in great detail in the Corbin Technical Bulletins,
Volume II. Rather than repeat each and every one of these calibers
along with the items that would make kits, I'll just list a generic
catalog number and you can pick the numbers to fill in from this list:
Available diameters in Corbin Handgun Reloading Press Swage
Dies...
.251 .308 .312 .314 .355 .357 .358
To order a specific caliber of die, specify either the actual
caliber or the diameter of the bullet from the above list. If you
specify the caliber of the cartridge, we will use standard
specifications to determine what diameter to ship. Unless you specify
the actual diameter from the above list, it isn't possible to guarentee
that what you really wanted is the same as the standard specifications
for the caliber you ordered. If your 9mm happens to have a .357 bore,
then order a .357 diameter rather than a 9mm. Die makers go by the
actual diameter, not by the cartridge designation.
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ECONOMY HANDGUN KIT
The basic handgun package can have just the core seating die and
the Keith nose punch provided with it, to make semi-wadcutter type
bullets. To add greater versatility, purchase the point forming die to
go with the set. Here is the basic wadcutter or semi-wadcutter package
that I would suggest. It makes lead, gas-checked, half-jacketed, or
3/4-jacketed bullets (not with the jacket curved around the ogive,
however. That is the job of the point forming die).
CS-1-R Core Seating Die, with Keith punch. (Specify caliber)
CSL-2 Corbin Swage Lube, 2-ounce bottle
CM-4 Corbin 4-cavity adjustable core mould. (Specify caliber)
Now, in the department of bullet jackets, there are certain
options open for .25 caliber that don't apply elsewhere. You can
purchase a .25 ACP jacket-making kit (SPJM-25R) that turns fired
shotgun primers into 45-50 grain jacketed bullet cups. In all the .30
calibers, from .308 to .314, you can use one size of jacket. In the
.380, 9mm, and all .38/.357 Magnum calibers, you can also use one size
of jacket (diameter). There are several lengths available in .38.
The right length of jacket for a semi-wadcutter of standard weight
is the .437-inch length in .38, and for stacking multi-projectiles or
half-jacket bullets, the .250-inch jacket is ideal. The 0.5-inch long
jacket is a bit heavy for most single-die sets, but if you add the
second die (point former) it is the best all-around choice for all but
the very heaviest weights. For 200 grain and up, the 0.7-inch jacket
is what you need.
To complete your kit, select one of these jackets for the single
die set, or the jacket-making kit for the .25 ACP:
SPJM-25R Shotgun primer jacket-maker kit
J-30-375 Jacket, 30 caliber, 3/8-inch length, box of 500
J-38-250 Jacket, 38 caliber, 1/4-inch length, box of 500
J-38-437 Jacket, 38 caliber, .437-inch length, box of 500
J-38-500 Jacket, 38 caliber, .500-inch length, box of 500
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DELUXE SEMI-WADCUTTER SWAGE KIT FOR HANDGUN CALIBERS
I don't see how a person could consider his swaging outfit as
being deluxe unless he has the point forming die. With this die, you
multiply all the previous styles and shapes to incredible levels. You
add the ability to curve the jacket around the ogive, to make
boattailed and full-jacket bullets, and to curve the ogive around so
that a hollow cavity becomes a pear-shaped or even a closed cavity
within the tip of the bullet.
When you order the PF-1-R point former separately, be sure to send
a sample lead slug and a few seated cores from your existing core
seater die (CS-1-R). The die has to be carefully matched in diameter,
and this is one way we can do it. Another is to get your die back, but
you may not want to part with it while we work on the new die.
When you order these items, substitute the diameters listed for
the "XXX" in the die set catalog number.
BSD-XXXR Core Seater and Point Former, 2-die set
CM-4 Corbin 4-Cavity adjustable core mould. (specify caliber)
CSL-2 Corbin Swage Lube, 2-ounce bottle
PE-1 Corbin Power Ejector Unit
HCT-1 Corbin Hand Cannelure Tool
LW-25 Lead wire, 25 lb. spool (specify caliber)
PCS-1 Corbin Precision Core Cutter
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.he CHAPTER 10 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
INDIVIDUAL DIES FOR THE RELOADING PRESS
You can make up your own swaging kit for a reloading press, or you
can add dies to existing kits and expand your bullet-swaging
capabilities caliber by caliber.
With the suggested kits in the previous chapter, I didn't suggest
any lead tip dies. They are very useful in the three rifle calibers,
when you want a nice factory-finished lead tip. But they are something
you can add at any time. It isn't necessary to match this die as
exactly as with the core seater and point former. A half-thousandth of
an inch tolerance is plenty, and that is easy enough for the die-makers
to handle without getting your set back.
Individual dies are available in these styles and calibers:
.224 6-S Ogive CS-1-R, PF-1-R, LT-1-R
.243 6-S Ogive CS-1-R, PF-1-R, LT-1-R
.257 6-S Ogive CS-1-R, PF-1-R, LT-1-R
.251 RN, TC ogive CS-1-R, PF-1-R
.308 RN ogive CS-1-R, PF-1-R
.312 RN ogive CS-1-R, PF-1-R
.314 RN ogive CS-1-R, PF-1-R
.355 RN, TC ogive CS-1-R, PF-1-R
.357 RN, TC ogive CS-1-R, PF-1-R
.358 RN, TC ogive CS-1-R, PF-1-R
When you order the CS-1-R, it comes with a flat base internal
punch and a Keith external punch in the handgun calibers. In rifle
calibers, it comes with flat base internal and open tip external
punches. If you would like to add other shapes to the handgun
calibers, you can order these additional punches:
(1) Conical (semi-wadcutter angled to a point, like a pencil)
(2) Round Nose (semi-wadcutter eliptical round nose)
(3) Hollow Point (universal projection punch, used with any other)
(4) Wadcutter (slightly raised button nose style)
(5) Cup Nose (a shallow, round cup shape)
(6) Open Tip (a punch that fits inside the jacket, for 2-die sets)
Those are nose shapes available, in standard off the shelf designs
only. In this system, the punches are made to standard patterns and
cannot be made to special order without incurring regular time and
material charges over the usual punch price. With current salaries for
die-makers where they are, you may not be thrilled to hire one to make
a punch slightly different from standard (chances are, your target
would never know the difference anyway).
Base shapes can also be changed by ordering an extra punch.
There are internal punches to replace the standard flat base. You can
order:
(1) Dish Base (very shallow curve to the edge of the jacket)
(2) Cup Base (slightly deeper, like the cup nose, with flats to
the edge of the bullet)
(3) Hollow Base (very deep, like the hollow point punch. Not well
suited to jacketed bullets but nice for lead bullets)
The rifle calibers are always ordered with a matching point former
die. You can't make a complete bullet in the CS-1-R alone for a rifle
caliber, since the velocity is so high that pistol designs tend to be
unstable and have poor ballistics. You are welcome to order these dies
for replacements, but good luck trying to make a finished bullet in
one! When you order the core seater and point former as a set, it
makes up the BSD-xxxR catalog number. You don't need to order each
one, if you specify the BSD-xxxR.
All punches are ordered with the catalog number "PUNCH-R" for
reloading press use. Then, specify internal or external punch,
caliber, and shape (if it needs to be specified, as with noses for
handgun punches). To order a replacement ejection pin for the point
forming dies, always specify the caliber. You can call it a "PUNCH-R"
and specify ejection pin, plus caliber. That will get it.
Core seating punches for the rifle calibers are made in different
diameters to fit inside the various jackets available. Either tell us
the diameter you want and we will supply the closest standard diameter
that we have, or send a sample jacket to match. In the .224, we have
two core seat external punches. One fits the rimfire jacket, and one
fits the commercial jacket that we sell. The diameters are 0.204 and
0.197 inches, respectively.
Many people have commented that they were not able to make a light
enough bullet with a certain jacket. After I checked it out, I found
that the problem was the style of bullet. Most of the standard jackets
make just about any weight you like, if you know how to make use of the
punches and dies. The open tip core seating punch will push a short
lead core as far into the jacket as you like. Then the point forming
die will wrap the end of the jacket around the ogive, and the bullet
can be as light as you wish.
The problem is with solid lead tip Keith style bullets. They fill
the jacket, and then some. Typical jackets available today make
maximum weights for the caliber with this sort of style. The answer is
to use the hollow point and cup base punches on the bullet first, then
follow with the Keith punch. This lets you use a lot less lead, moves
it forward so it can form lead nose within the cavity of the Keith
punch, and thus produces a very light bullet in a very long jacket.
One last point about reloading press dies: they are just as good
as any other kind, except that they are made to fill the need for
entry-level, lower cost bullet-making. Rather than cut corners on
quality, we decided long ago that the best approach was to limit the
styles, calibers, and options available to a managable, popular group
and then make the equipment in longer runs, without the expense of
individual, custom work.
When someone calls and insists on having a reloading press die,
but with some special options that are not standard ones, they are in
effect crashing the whole idea of equal quality at lower cost. If one
can afford the expense of the custom work, they can probably save money
by getting the Mity Mite system to start with. It was designed with
custom work in mind. And if someone doesn't want to buy the press, but
just wants the dies made special, then they should consider the cost of
the die-maker's time. It amounts to buying the press anyway. Why not
get it? Then, everything made in the future will still fit and
interchange properly. Custom work usually doesn't.
.he CHAPTER 11 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
DRAW DIES
Draw dies, or drawing dies (as they are also called), are simply
ring dies used to reduce the diameter of a component. When you size a
cast bullet, you are using a much less precise version of a draw die.
The draw dies made by Corbin are extremely hard, tough venturi-shaped
tools held in a 7/8-14 TPI body. A punch pushes the component through
the die and out the top.
There are two general types of draw dies. The JRD-1 can be made
either for bullets, or for jackets. The bullet draw die reduces a
finished bullet by a small amount, sometimes as little as 0.0005
inches, and sometimes as much as 0.003 inches. However, greater
reductions cause distortion of the bullet and are not feasible.
Jacket draw dies can reduce an existing jacket by a whole caliber.
This is the way that .41 caliber jackets are obtained today, for
instance. A .44 caliber jacket is pushed through a draw die and
reduced to .41 caliber. This would not work with a bullet. Jacket
drawing punches fit inside the jacket, and actually push it through
base first, while bullet draw dies push the bullet through nose first.
Special versions of draw dies turn fired .22 cases into .224 or
.243 caliber rifle jackets. The .22 WMR case can be drawn to a long
6mm jacket in another die, and shotgun primers can be turned into free
.25 ACP jackets with another. Draw dies perform a remarkable service.
Their limitations are discussed in "REDISCOVER SWAGING" in detail.
Dies ending in "R" fit the standard reloading press and have a punch
that fits into the press ram. Dies ending in "M" fit the Mity Mite
press, and have a punch that screws into the press ram. The die goes
into the press head, replacing the floating punch holder. Dies ending
in "H" are made for the Corbin Hydro-press. They have a long punch
that screws into the ram, and the die fits into a 7/8-14 adapter which
in turn fits the 1.5-12 thread of the press head, also replacing the
floating punch holder.
RFJM-22R Rimfire Jacket Maker, 22 LR to .224 caliber
RFJM-6MR Rimfire Jacket Maker, 22 LR to .243 caliber
SPJM-25R Shotgun Primer Jacket Maker, 25 ACP caliber
JRD-1-R Jacket Reducing Die, specify starting and ending
caliber.
Draw dies for the reloading press are used by adjusting the die
position so that you can push the component through the tightest part
of the die using the end of the stroke. Careful die setting is
necessary so that the component is pushed far enough into the die, yet
the more powerful portion of the stroke is still utilized. If you
simply put the die in the press at random settings, it might not be
possible to push the component far enough so the next component pushes
it out the top. Or, it might require so much effort that the operation
becomes impossibly difficult.
It is important to realize that effort varies quickly with the
exact part of the stroke where the most resistance is met. This is
adjustable by your setting of the die. Too high, and the press easily
pushes the component in, but not nearly far enough. Too low, and the
press has little leverage or power to do the job, even though there is
plenty of stroke to push the component through. The optimum adjustment
can be found in a few attempts, if you bear the critical nature of this
balance in mind.
It might seem as if a draw die is a very inexpensive way of
creating a custom bullet. In a few limited instances, it is. But, for
most calibers, reducing an existing factory bullet to a smaller size is
more expensive than making it yourself, produces a far less accurate
bullet, and limits you to the same weight and basic style as the
factory bullet itself. Giving up the advantage of superior accuracy,
the ability to make the bullet in any weight or style you wish, and the
cost savings of using jackets and lead instead of buying ready-made
bullets, seems like quite a bit to give up just because drawing a
bullet down seems simple.
The lure of getting an inexpensive bullet-production die sometimes
overwhelms one's sense of values, though, and it isn't uncommon for
someone to sacrifice all these advantages -- all the real power of
bullet swaging -- in order to draw down some existing bullet. In the
instance of the .357 and 9mm, the two 8mm diameters, and sometimes in
the reduction of a military bullet purchased very cheaply in quantity,
the process works well enough to justify the lost advantages. It isn't
a general cure, and it certainly does not replace swaging your own.
On the other hand, a jacket draw die makes good sense. The jacket
will be expanded by internal lead pressure during swaging, so any
diameter changes made to it are rather unimportant to the final
product. The ability to change standard diameters, to use an existing
longer jacket or heavier design in the next smaller caliber, is a good
advantage. Sometimes, it is the only way to obtain a good, inexpensive
jacket. In .41 caliber, a drawn .44 is the standard jacket used by
bullet swagers. Likewise, for the .40 calibers.
One does pick up a little longer draw on one side of the jacket
when the reduction is extreme. This is unavoidable without extremely
high cost equipment, but its effect is primarily cosmetic: the tip of
an open tip jacket may appear uneven. Accuracy generally seems
unaffected by this, since the jacket walls themselves seldom become
eccentric in any normal drawing operation.
A set of dies to make .14, .17, and .20 caliber bullet jackets
from commercial .224 0.6-inch length jackets is available from Corbin.
The process of making sub-calibers involves drawing the standard .224
jacket through these three stages, stopping at the stage you desire.
The jackets must be annealed after the first draw (from .224 to .20
caliber) or else the end will break out on the next draw or during
swaging.
Since the jacket for a .17 or .14 usually is shorter than that for
a .224, the jacket must be trimmed at some point. This can be done in
the first draw, from .224 to .20, using a PINCH-TRIM die and punch.
The punch is made with a shoulder, so that the shoulder to tip length
determines the length of the jacket. Any jacket that extends beyond
this punch step or shoulder will be sheared off as the punch passes
through the die constriction.
The process works well provided the correct jacket is used, since
the temper, grain, and diameter as well as wall thickness are somewhat
critical for proper shearing action. Usually, the jacket will be made
quite short, and will be drawn longer in the .17 and .14 stages. The
exact final length is a bit experimental, since variations in jacket
lots, temper, wall thickness, and material composition will produce a
somewhat different final drawn length. But it seems quite consistent
within one lot or kind of jacket.
Jacket and bullet draw dies that fit the reloading press or the
Mity Mite press require careful adjustment so that the maximum leverage
can be properly utilized to push the component through the tightest
point in the die, yet still gain maximum stroke within the required
leverage range. In some cases, such as drawing copper tubing to make
long rifle jackets, there isn't any easy way to get enough stroke and
enough power at the same time. In those instances, a short "helper"
punch or rod must be used.
The jacket is drawn in two stages. First, the jacket is started
into the die using the end of the stroke, where there is sufficient
power. Then, the ram is drawn back, the helper rod inserted in the
jacket, and the ram is run forward again, gaining extra stroke to push
the component all the way through the ring die. This is, admittedly, a
slower way to do the job. But in some cases, it is the only thing that
works in a hand press.
Dies made for the Hydro-press, on the other hand, seldom have any
such difficulties because the programmable Hydro-press develops
whatever power is needed, at any point in the stroke cycle. With a
full six inches of stroke to work with, and full power from top to
bottom, it is a simple job to draw just about any length or thickness
of jacket in one stroke. Copper tubing jackets are a product that
point up the advantages of the Hydro-press design.
Remember that in most home swaging operations, you are
accomplishing tasks in very few steps, with relatively inexpensive
equipment, that the major factories spend tens or hundreds of thousands
of dollars in time and equipment to accomplish, often in 10, 12, or 14
stages. Sometimes, there are obvious limitations to what you can do
without a bit of leeway in your final lengths or weights. (Sometimes,
the amazing thing is that the process works at all!)
On the other hand, for the person who doesn't mind experimenting
and can put up with things coming out just a bit differently than his
original blueprints might have demanded, these processes offer a great
deal of freedom from high costs, abritrary supply sources, and the
ability to make bullets that are extremely accurate and unusually high
in performance. Just don't confuse accuracy and performance with
predictable adherence to a pre-existing design concept! Sometimes, the
way it happens to come out is what you have to work with, in the
practical world of limited costs, simple operations, and available
supplies. Fortunately, the way it comes out is usually pretty darn
good!
.he CHAPTER 12 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
SWAGE DIES of the MITY MITE SYSTEM
There are so many different styles, calibers, and kinds of bullets
possible in the Mity Mite system, that it isn't practical to list
"kits" or tables of standard bullets you can make. If it falls in the
range of .14 to .458 caliber, with a weight not over 450 grains, and a
length not to exceed 1.3 inches base to tip, you can probably make it
in the Mity Mite.
In the realm of jacket making, the Mity Mite system can form
copper tubing into excellent jackets with limitations to wall
thickness: the standard thickness offered is 0.030-inch, in copper
tubing. Steel, brass, or thicker walls are not practical in this
system, but require the power of the Corbin Hydro-press system.
If I were to suggest a good starting package for the beginning
bullet maker, it would usually consist of the following items:
(1) One or more Mity Mite presses (CSP-1)
(2) A set of dies in the style desired (normally, FJFB-3-M)
(3) A bottle of Corbin Swage Lube (CSL-2 or CSL-16)
(4) A jacket supply...
which could be one of these:
(a) A CTJM-1-M tubing jacket maker (.030-wall)
(b) A quantity of Corbin bullet jackets (usually, 1000)
(c) A rimfire jacket-maker (RFJM-22M or RFJM-6MM)
(d) A sub-cal jacket drawing die set (JRD-1-M, one each
for .20, .17, and .14 draws)
(e) No jackets -- for lead bullets
(f) A JRD-1-M jacket reducer and supply of next-larger
jackets, where required
(5) A lead core supply...
which could be one of these:
(a) Lead wire (LW-25) and core cutter (PCS-1)
(b) Core mould (CM-4)
(c) Sub-cal extruder (LED-2) kit
These are all you really need to consider. There are optional
items that I might want, having been through it all before. They
simply make life a bit easier and produce better bullets. These
optional items include:
(1) Cannelure tool (HCT-1)
(2) Bullet polisher kit (BPK-1)
(3) Dip Lube (CDL-16) to preserve finish, or for lead bullets.
(4) Instrument grade lubricating oil (FSO-16) to preserve dies
(5) Cleaning solvent (CCS-16) for dies and bullets
(6) Core Bond (CCB-16) to make bonded core bullets
(7) Extra floating punch holders (FPH-1-M)
(8) Extra ejection pins (PUNCH-M, specify caliber, internal PF,
and/or actual diameter if known)
As to exactly WHICH size of jacket, mould, lead wire, or die set
model to get, you can just indicate the weight and style of bullet you
want to make, either with a sketch, a sample, or reference to one of
the drawings or photos in any Corbin book (give title and page number).
The die-maker will work out the correct combination to get where you
want to go, using the closest available materials.
That still leaves you a bit in the dark as to which of the many
sets of dies will make the bullets you want. Here is a check-list
describing many general kinds of bullets, and the dies that will make
them:
A. LEAD BULLETS WITH SMALL SHOULDER BEFORE START OF NOSE
(1) Use LSWC-1-M single die set
(2) Specify caliber
(3) Specify base shape:
a. Flat Base (standard)
b. Dish Base (shallow concave from side to side)
c. Cup Base (flat margin around deeper concave portion)
d. Hollow Base (more than 1/2 caliber deep cavity)
(4) Specify nose shape:
a. Keith Nose (standard for handgun)
b. Round Nose
c. Wadcutter Nose
d. Conical Nose
e. Hollow Point (a universal HP, used with any above)
f. 1-E (1-cal. long eliptical, standard for rifle)
(5) Specify weight range desired (max. 450 gr.)
B. LEAD BULLETS WITH NO SHOULDER BEFORE START OF NOSE
(1) Use CSW-1-M and PF-1-M (core swage and point form dies)
(2) Specify caliber
(3) Specify ogive radius or nose shape
a. Tangential ogives from 0.5 to 10-S (6-S standard)
b. Spire point (12-degree standard)
c. Round Nose (same as .5-S or .5-E shape)
d. Eliptical ogive from .5-E to 2-E (1-E standard)
e. TC (truncated conical - standard handgun)
f. Dual-diameter, other special form (send sketch)
(4) Specify base shape (same as in A.)
(5) Specify weight range desired (max. 450 gr.)
C. JACKETED SEMI-WADCUTTER OR WADCUTTER
(1) Use JSWC-1-M (core swage and core seater)
(2) Specify caliber
(3) Specify Nose shape (same as A.)
(4) Specify Base shape (same as A.)
(5) Specify weight range (max. 450 gr.)
(6) Specify jacket (Corbin size, or send sample)
D. FULL JACKET, OPEN TIP OR HANDGUN SOFT POINT, OR FMJ OPEN BASE
(1) Use FJFB-3-M (core swage, core seater, and point form)
(2) Specify caliber
(3) Specify ogive radius or nose shape (same as B.)
(4) Specify Base shape (same as A.)
(5) Specify weight range (max. 450 gr.)
(6) Specify jacket (Corbin size, or send sample)
E. FULL JACKET, LEAD TIP RIFLE OGIVES
(1) Use LTFB-4-M (as in D. but with lead tip die added)
(2) Specify all items as in D.
(3) Specify tip shape
a. flat
b. spitzer (sharp point to match PF-1-M die shape)
c. semi-spitzer (radius at tip)
d. round
F. REBATED BOATTAIL OPEN TIP RIFLE STYLE
(1) Use RBTO-4-M (core swage, RBT-2 set, point form)
(2) Specify all items as in D.
G. REBATED BOATTAIL AND FLAT BASE, OPEN TIP RIFLE STYLE
(1) Use FRBO-5-M (3-die set with RBT-2 set added)
(2) Specify all items as in D.
H. REBATED BOATTAIL WITH LEAD OR OPEN TIP
(1) Use FRBL-5-M (same as F. with LT-1-M added)
(2) Specify all items as in E.
I. REBATED BOATTAIL or FLAT BASE, LEAD or OPEN TIP (all style)
(1) Use FRBL-6-M (complete set of all dies)
(2) Specify all items as in E.
Note that each set of dies simply adds additional kinds of dies to
one of the more simple sets. You don't lose any capability as you go
up in versatility. The only decision that might be somewhat difficult
is between a LSWC-1-M lead semi-wadcutter die and a JSWC-2-M two-die
set for either jacketed or lead semi-wadcutters. The LSWC-1-M is a bit
faster if you are certain that you don't want to make jacketed bullets.
But the JSWC-2-M set handles both kinds well.
The FJFB-3-M and all higher sets still preserve the ability to
make lead bullets or semi-wadcutters, provided you order the desired
nose punch to fit into the core seating die. The exception is that the
RBTO-4-M and the RBTL-4-M do not have a standard core seating die for
flat base bullets. They cannot make a conventional handgun style
without a rebated boattail, since there is no die included to do it.
When you order a die set for rifle calibers, and we know it is for
a rifle caliber, we provide a punch to fit INSIDE the jacket you
specify (and if it isn't one of ours, we need samples or we cannot make
the dies). Rifle style implies that the jacket will curve around the
ogive like a rifle bullet jacket. It is very popular for open tip or
soft point handgun bullets, not just for rifle calibers.
A more limited handgun style is the semi-wadcutter. This is a
generic term to the die-maker, not a specific shape. It means that the
bullet has a nose made of lead, with the jacket stopping short of the
ogive, so there can be a shoulder where the end of the nose-forming
punch presses against the lead. In a rifle-style set with a point
forming die, there is NO nose-forming punch: the point forming die
itself controls the shape of the ogive and nose.
INDIVIDUAL DIE DESCRIPTIONS
CSW-1-M Core Swage Die, Mity Mite
This is the first die in most sets, except for the LSWC-1-M.
In the lead semi-wadcutter set, the single die performs the function of
the core swage and the core seater in one operation, since it operates
on lead and has no jacket. It is, in essence, a core swage made to
final diameter, and fitted with nose and base punches. The true core
swage die has flat-ended punches, and is used only to adjust the
diameter and length, roundness and weight of the raw lead core. The
core swage die has bleed holes through which surplus lead is extruded
to adjust the weight on each stroke.
Core swage dies are made to a diameter which accepts a standard
size of lead core, and increases it to a close fit to the proper jacket
size. Since jacket wall thickness can be selected from a wide range of
jackets, including tubing or thin rimfire case jackets, the core swage
must be matched to the jacket wall as well as caliber. Some sets use
more than one core swage, to allow changing to different jacket
thicknesses.
LSWC-1-M Lead Semi-wadcutter Die, Mity Mite
A special form of core swage, in which the bore diameter is
made final bullet size and the punches are made to form the base and
nose shape. This die operates on lead or half jacket bullets only. It
is faster than using a two-die set such as the JSWC-1-M, but is less
versatile since it does not handle a 3/4-jacket.
CS-1-M Core Seating Die, Mity Mite
The core seater can form a finished handgun bullet of the
semi-wadcutter style (or wadcutter style) either with or without the
use of a core swage to adjust the core weight. Combined with a core
swage, it makes up the JSWC-2-M jacketed semi-wadcutter set. It is
always used prior to forming the ogive on an open tip or soft point
bullet, in order to generate enough internal pressure to expand the
jacket and form a straight, round shank on the bullet.
RBT-2-M Rebated Boattail 2-Die Set, Mity Mite
The rebated boattail set consists of a pair of dies that
replace the regular CS-1-M core seater. The jacket (ordinary flat base
type) is put into the first die, which is called the preform or BT die.
The core is pushed into the jacket. A punch enters the mouth of the
jacket and presses on the core, expanding the jacket to fit snugly
against the die walls. The base of the die cavity has a boattail
shape, which transfers to the jacket base.
The second die of this set has very closely matched diameter and
taper to the first die. It also has a shoulder or edge machined into
the cavity. The smoothly tapered jacket from the first die is placed
in the finishing, or RBT die (second die). The same external punch is
used to push on the lead core, creating internal pressure that presses
the tapered base against the shoulder in the die. A rebate or step is
created in the jacket from this internal pressure.
The seated core and jacket are now ejected and put into the point
forming die to be completed. The regular core seating die (CS-1-M) is
not used when making a RBT bullet.
PF-1-M Point Forming Die, Mity Mite
The point forming die has the actual bullet shape machined
into its interior cavity. It does NOT use a nose forming punch, as in
the CS-1-M or LSWC-1-M dies, but has a small spring-steel ejection pin
in a tiny hole at the tip of the die. The seated core and jacket from
the core seating die (CS-1-M) or from the RBT-2 die set is put open-end
first into the PF-1-M die (to make open tip or soft points), and a
full-caliber-size punch that fits into the point forming die presses on
the bullet base to shape the ogive.
It is not advisable to make the complete bullet in this die only,
except for full-jacket, open-base styles. The reason is that this die
does not form a sealed system, as with the core seating die, since one
end is virtually open during forming. The pressure within the die
tapers from base to ogive in a complex pattern depending on ogive
shape, and is not normally capable of expanding the jacket shank
properly by itself. That is why the core seating die pre-forms the
shank prior to using this die.
Several different bullet shapes can be made with the same die set
by purchasing various point forming dies. The match of the point
forming die to the core seater is extremely critical. Samples of
seated cores are required to make another point forming die for a given
set. It is normally best to order additional styles of point forming
dies with the original set, but with sample seated cores or the return
of the set, a new point forming die can be matched to the core seater.
LT-1-M Lead Tip Forming Die, Mity Mite
The lead tip die shapes the exposed lead at the tip of the
bullet after the bullet has been formed in the point forming die. It
is normally used only for sharp rifle ogives, not for blunt handgun
shapes. When the tip of the bullet must be smaller than the diameter
of the ejection pin required for a given caliber, the lead tip die can
be used as a finisher to bring the tip slightly more closed, or to
shape the exposed lead into a proper point after the ejection pin in
the point forming die has deformed it during ejection.
A lead tip die can be added to any set, provided that the set has
a point forming die. Lead tip dies are not used with JSWC-1-M or LSWC-
1-M sets. A lead tip die cannot be used by itself to form a bullet.
It must act as a "clean-up" die for the tip of bullets formed in the
point forming die. The internal punch of the lead tip die can be
changed to various shapes, in order to make flat tip, blunt round tips,
semi-spitzer or sharp spitzer lead tips.
A benefit of the lead tip die is that one can use a sharp ogive
point forming die, and yet produce a good-looking flat tip. This can
be desirable with a .308-caliber set, where bullets for .30-06 and .300
Winchester can be made at the same time as bullets for the tubular
action .30-30, by finishing the .30-30 bullets with the LT-1-M die.
MATCHED SETS OF DIES
LSWC-1-M Lead Semi-wadcutter 1-die Set, Mity Mite
A "set" can be any number of dies, including one, as long as it
makes a completed bullet without the need of other dies or punches.
The LSWC-1-M is listed here because it forms a complete semi-wadcutter
style bullet (or a wadcutter, or a lead rifle bullet with a small
shoulder between the ogive and the shank). Normally the external punch
forms the nose and the internal punch forms the base, especially in
handgun bullets. Some rifle bullets are made using the internal punch
to form the nose.
Remember that the external punch fits into the floating punch
holder, a threaded cylinder which fits into the press head and does all
the adjusting for die volume and bullet weight (as a direct result).
The internal punch remains in the die, and is operated by the geometry
of the ram, sliding back to allow maximum bullet weight while sealing
off the threaded end of the die against swaging pressure, and sliding
forward to eject the bullet.
The LSWC-1-M is normally stocked in .25 ACP, .308", .312", .314",
.355", .357", .358", .400", .410", .429", .452", and .458" diameters.
It can be ordered in any diameter between .14 and .458 as a special
order. Normal punches are either flat, cup, or hollow base, and
wadcutter, Keith semi-wadcutter, round nose, conical, or hollow point
(a universal and very deep hollow cavity punch that can be used with
any of the other punches to produce interesting results). Rifle
calibers normally are made with a one-caliber-length, eliptical round
nose, and either a flat or cup base.
The LSWC-1-M is made for soft lead. It can handle hard alloys
without breaking if you are very careful, but it is folly to use them
in calibers over about .314" diameter. It is not the hardness of the
alloy that breaks a swage die: it is the fact that the operator pushes
too hard trying to make the hard alloy flow and fill out the die. You
are perfectly safe in using hard lead if you don't push any harder than
you would for soft lead. But that amount of force may not be enough
for the hard alloy to flow. Hard lead by itself does no harm to the
die.
If you use a .44 caliber die or larger, it is almost a certainty
that sooner or later you will break the die if hard lead is used. Dies
broken by excess pressure are the responsibility of the operator who
applied the pressure. Old Theodore Smith, a pioneer of swage die
manufacture and, prior to the growth of the Corbin firm, one of the
largest suppliers of swage dies in the world, used to say that he ought
to write his instructions to read "jump on the handle with all your
might, then remove the die you just ruined and send it and a check for
a new one to the die-maker".
Anyone who has ever broken a swage die says "...but I wasn't
applying THAT much pressure! It felt about like it always does, then
the die broke!" With a little more experience, it is easy to feel the
little bit of excess force that breaks a die. A swage die for the Mity
Mite press can handle 171,745 psi in .224 caliber, and 103,548 psi in
.458 caliber. That is the ultimate strength. A tiny bit more and
CRACK! When the press is adjusted to go "over center", using the
nearly infinite leverage of the short stroke system, it is easily
possible to generate pressures over 200,000 psi. Use only enough so
that soft lead -- pure, soft lead -- forms correctly. If a hard alloy
can be formed with that pressure, wonderful. But if it refuses to form
without "a little bit more", then check your replacement die funds
before proceeding to apply it!
This friendly warning applies to any of the dies, but it is
especially true with the LSWC-1 since many people order these in large
calibers and want to make alloy bullets. If you truely need hard
alloys, I strongly suggest that you consider the Hydro-press dies and
either the Hydro-press itself, or the Mega Mite press. The Mega Mite
doesn't always have enough leverage for hard alloys in the largest
calibers, but it makes a good .50 caliber soft lead bullet and it can
handle hard alloys in any caliber without breaking the die. The Hydro-
press never says never. It just idles along while swaging linotype
alloy, and yawns with boredom when you try to challenge it with jobs
that leave hand press dies in a pile of rubble.
JSWC-2-M Jacketed Semi-wadcutter 2-die Set, Mity Mite
The job of making jacketed or lead bullets in two steps, instead
of one like the LSWC-1-M, means you can use jackets that cover the
sides of the bullet. These would normally block the bleed holes on the
LSWC-1-M. If you plan to make both lead and jacketed semi-wadcutters,
this is the right choice. It consists of both a core swage and a core
seating die. The core swage is made to produce a lead core to fit into
the normal jacket used in the caliber. The core seater is made final
diameter for the bullet, and has nose and base punches.
Some people want a bevel base bullet, a boattail bullet, or a
round nose with no step between shank and ogive. These things can
only be approximated in the straight-walled core seater die. The nose
punch does not have an invisible, razor-sharp edge. It has about
0.020-inches of metal at the edge. This lets it last for your lifetime
and probably that of your grandchildren, instead of wearing away in a
few bullets. It also means there has to be a step or shoulder of about
0.020-inch depth between the nose (formed in the punch cavity) and the
shank (formed against the die wall).
I see little point in the bevel base in this kind of die, since
the shoulder made necessary by the punch really doesn't solve the
problem of getting the bullet easily into the case mouth. A very
slight bell to the case mouth solves it. If you want a true bevel, get
the next die set. It has a point forming die, which has NO internal
punch (in the normal sense of forming the bullet nose), but forms the
bullet against die wall all the way to the end. You can reverse the
bullet and tap in into the die lightly (with a precise adjustment of
the punch holder, this is more repeatable than I made it sound). This
gives you a perfectly formed bevel or taper on the base, very slight
but also very streamlined and adequate to align the bullet in the case.
FJFB-3-M Full Jacket, Flat Base 3-die Set, Mity Mite
This is the workhorse of the system. More of these sets are made
and sold than any other. That is because they do what most people
want, making lead bullets, semi-wadcutter bullets, or fully-jacketed
bullets of either open base or open point style.
When we say full jacketed bullet, it can mean two different
things. Most people mean a military full jacket with open base, which
is formed by putting the base of the bullet jacket into the point
forming die first, instead of the open end going in first. But handgun
people often use the term full jacket to mean that the jacket curves
around the ogive, covering part or all of the nose section. The
alternative is the three-quarter jacket, or the half-jacket design.
A three-quarter jacket bullet is the kind that is formed when you
use the JSWC-2-M set and a jacket that covers the shank completely, but
leaves the lead nose to be formed in the punch cavity. The JSWC-2-M
die set can't bring the jacket up around the nose at all, not even a
tiny bit. This is because the edge of the punch which forms the nose
in that set strikes the edge of the jacket, unless you have enough lead
to completely fill the punch cavity.
A half-jacket bullet has half its shank covered by jacket and half
the shank made of exposed lead (as well as the entire nose). Half-
jacket bullets are not really much better than lead ones as far as
velocity and fouling are concerned. But half-jackets still make great
short, light bullets in a 3/4-jacket style! Confused?
Look at it this way: there are names we give the jackets that are
based on the normal bullet weight made in that jacket, and then there
are the names we give bullets regardless of weight. If you make a
light bullet in a short jacket, it can have the whole shank covered by
jacket. And then, it is a 3/4-jacket bullet even if the jacket was
originally made for 1/2-jacket designs. Conversely, if you use a so-
called "full" length jacket for a handgun, and make a normal weight of
rifle bullet (such as using a 0.7-inch long .38 handgun jacket to make
a 250 grain .358 rifle bullet), you really wind up with what amounts to
a half-jacketed bullet.
So, if you want to play with unusual weights (and I say, go for
it! Why not explore it all since swaging gives you the power to do
so?) you may wind up having to order jackets by their catalog number
and forget about what the rest of the world considers that jacket good
for making. The terms half, three-quarter, and full jacket are a crude
approximation, anyway. We'd be better off without them. Length in
inches is much more precise.
The three-die set (FJFB-3-M) has a core swage and a core seater,
but the core seater usually is made just slightly (0.0005 to 0.0001
inch) smaller than if you were to order the same caliber in a JSWC-1-M.
Does this mean you can't add a point forming die to a JSWC-1-M and thus
produce a new set exactly like a FJFB-3?
No, but the die-maker should either get the set back or should be
given several lead slugs swaged in the core seating die. Then he can
use the slugs, or the die set itself, to make a point forming die that
is 0.0005 to 0.0001 inches larger than the core seater! One way or the
other, there needs to be a microscopic difference to allow proper
ejection of the final bullet. Remember that swaging is a process of
upward expansion to meet the die walls. Shoving a bullet that is
already at final diameter into the same diameter of die is a formula
for stuck bullets and difficult ejection.
While we are on the subject, let me comment that diameter
differences of even 0.001 inch make very little difference in where the
bullets will group, provided all the bullets fired are the same
diameter. In the real world, you can get away with shooting a .309
bullet in a .308 barrel and probably win the Nationals either because
of or in spite of it, and everyone else will rush out to buy the same
kind of oversize bullet once you do it. What counts is consistency,
not absolute size. On the other hand, you can get considerably worse
groups if the bullets are 0.001 inch smaller than bore size. So, I
usually recommend the nominal size, or larger.
The FJFB-3-M set makes soft points (provided the die is made with
a handgun kind of ogive or a flat tip, and is not brought to a spitzer
point cavity) as well as open tip, open base (full metal jacket) as
well as open point, and hollow points (which are made with a hollow
point punch during the core seating operation) as well as open points.
An open point has the jacket longer than the core. A hollow point
has a hole poked into the lead core. You can combine both. To do
this, the core seating punch has a projection on its face that makes
the cavity in the lead core, and it also fits inside the jacket. A
normal hollow point punch fits the die bore, so that only the probe
fits into the jacket. Most hollow points are also lead tips.
The usual kind of punches supplied with the FJFB-3-M set depend on
whether it is a rifle or handgun caliber. Most rifle dies are
purchased to make open tip bullets, so a core seating punch with a flat
face, fitting inside the selected jacket, is provided. The base
punches (internal core seating, and external point forming) are flat
faced. The handgun sets normally have a Keith or a hollow point
external punch with the core seater, and flat base punches in the core
seater and with the point former.
However, just because the simple way to name this set required
using the term "Flat Base", don't be confused with the optional bases
you can make. Any kind of base that can be formed by pressing the
bullet base against a punch is perfectly suitable for this set. A dish
base, a cup base, or a hollow base set of punches (meaning, one for the
inside of the core seater, and one for the outside of the point former
to match it) will convert the set from flat base to any of these other
base styles.
Flat base is used here to differentiate the set from the Rebated
Boattail sets. Those sets have a different kind of core seater die:
in fact, they have two dies to replace the one flat base core seater.
If you want to make bullets for longest range shooting, or if you want
to experiment with low velocity, high efficiency bullets even at close
range (where the speed during flight will approach or cross the
transonic region at Mach I) then I would suggest the rebated boattail
sets that follow. But first, a word for the lead tip bullet....
LTFB-4-M Lead Tip, Flat Base 4-die Set, Mity Mite
You can make lead tips with a three-die set, provided that the
ogive is blunt enough to allow extremely easy ejection. The ejection
pin pushes on the lead tip, and with sharper ogives (such as the normal
rifle styles other than round noses) the pin pushes into the lead
because it usually takes a bit more pressure than the lead can
withstand to eject a very pointed bullet.
The result is a deformed blob of lead at the tip of the bullet.
To reshape this into a neat lead tip, and possibly to shear off surplus
lead, the LT-1-M die is added to the set. If you wish, you can
purchase the LT-1-M separately and make any open tip set into a lead
tip set. Or, you can purchase the set together under the LTFB-4-M
catalog number. This set makes all the bullets that the 3-die set
makes, plus good lead tips. Good lead tip bullets take a little
experimenting, to get the right amount of exposed lead.
Too much exposed lead usually doesn't hurt anything. Too little,
and you won't have enough to fill the cavity in the internal punch of
the lead tip die. The tips don't completely form, as a result. A very
light pressure is required. If you apply too much, you'll put a
shoulder in the jacket just below the tip from pressing the punch edge
against the jacket. The right amount of lead for the length of jacket
used places some limits on the weight of bullet that will work properly
and form a good lead tip. Some combinations of jacket length and core
weight don't form a good lead tip in certain shapes of bullets, which
you will find out quickly by experimenting. But a few grains more lead
hurts nothing, and gives the results you want.
RBTO-4-M Rebated Boattail Open Tip 4-die Set, Mity Mite
Here is the set for the long-range target shooter. If you shoot
high power rifle with a capital HP, meaning serious matches with a .30
caliber, then you should consider the lower drag coefficient and
consequent shorter time of flight of the RBT design. The rebate gives
you an edge in accuracy at the muzzle, deflecting the muzzle blast
gasses to the side so that they do not flow along the streamline of the
bullet and break up in front of it.
If you plan to make survival bullets, or copper tubing bullets, I
usually feel that the slight gain in ballistic coefficient isn't worth
the extra cost and trouble of making these bullets. There is one more
step involved, and with tubing it is a little more difficult to produce
as good a bullet as with flat base styles. It can be done, and it is
practical, but most situations involving bullets at more than twice the
speed of sound just don't benefit enough from the base design to bother
with any extra trouble.
This set doesn't have a regular flat base core seating die
included. It makes rebated boattails, of the open tip style, only. It
doesn't usually make FMJ styles, but you can use the point forming die
alone and make a pretty good open base full jacket "military" style
bullet with a flat base. Making an open base rebated boattail is not
practical with this equipment, nor does it have any advantage since the
open tip is usually more accurate and easier to produce.
FRBO-5-M Flat or Rebated Boattail, Open Tip 5-die Set, Mity Mite
This set adds a regular core seating die to the previous one, so
you can make either flat base or rebated boattails with the same set.
It is better to purchase this set together rather than adding on, since
the die-maker can match the diameters better when he has all the dies
in one place at the same time.
This set makes it easier to get a wide range of weights. A flat
base design lets you get lower weights in the same ogive shape, and a
rebated boattail lets you get lower weights for the same jacket length.
A flat base gives you the ability to make heavier weights using the
same jacket length. If you have a "universal" caliber like the .308,
which can produce anything from an 80 grain .32 ACP bullet to a 220
grain .300 Magnum slug, then this is a pretty good choice in die sets.
RBTL-5-M Rebated Boattail Lead Tip 5-die Set, Mity Mite
This set just substitutes a lead tip forming die for the core
seating die, which means you can make either open tip target bullets or
lead tip hunting bullets, but only with the rebated boattail base. The
reason for a person buying this set is to use the same kind of bullet
that he normally uses in his target shooting, and with which he is
presumably quite familiar, in a soft point hunting bullet.
The odds are that the high power shooter who does take such a
bullet (and, of course, the familiar cartridge and powder combination
to fit it) afield after game with a properly-sighted hunting rifle,
probably has a much better chance of coming home with meat for the
freezer than someone who uses a completely different caliber than his
usual, more familiar target experience requires.
The boattail design probably doesn't add much to the hunting
success, but it doesn't hurt. It's contribution is familiarity: if
you fire thousands of the same kind of bullet, less the lead tip, at
200, 300, 600, and perhaps 1000 yard targets in all kinds of wind
conditions, then chances are better that you can connect with a similar
bullet and load even if the range is less certain and the target is
moving. The range is probably 60 yards to 200 yards, more than half
the time, and the bullet is going so fast it doesn't have time to
notice its tail in that range, but the shooter has a good feel for the
drop and knows better how to hold for wind.
FRBL-6-M All Style 6-die Set, Mity Mite
Whatever you need, you can probably make it with this package of
dies. Many people go for this one simply because "you never know" what
you might want to try. That's not a bad reason. If you have the dies,
you can try things that you might otherwise never get around to doing.
And dies are a good investment: they don't seem to get any less
expensive with the passing of time. If you think there is much chance
you'll want to make a variety of different purpose bullets in a given
caliber, this is the right choice.
On the other hand, most handgun bullets can be produced just fine
with a 3-die set. There isn't much point in having either the lead tip
die or the rebated boattail dies for a .357 Magnum or a .45 ACP, since
there are tricks that let you make as good a boattail as anyone could
possibly use on these bullets, with the ordinary 3-die package. And
lead tips on blunt handgun bullets don't usually require the LT-1-M die
because the short bullet length and blunt taper make ejection easy
enough that the broad lead tip doesn't deform.
If you have rifle calibers in mind, and want to go first class, by
all means give the 6-die set some consideration. Even if you don't use
all the dies often, they will be ready when you do need them.
SPECIAL DIES FOR THE MITY MITE
Draw dies have already been discussed. In the Mity Mite system,
you can get sets of dies to reduce the bullet or the jacket diameter.
The punch fits into the press ram, and the die replaces the floating
punch holder in the press head. This is just the opposite of the
normal swaging set (where the die screws into the press ram, and the
external punch is held in the floating punch holder, in the head of the
press). For details on these dies, turn to the chapter on Draw Dies.
A unique die set for the Mity Mite is the LED-2 Lead Extruder Die
Set. This set solves a problem for the maker of sub-caliber bullets:
how to produce lead cores for the tiny .14, .17 and .20 bullets. Lead
wire is available, but a normal 175,000 grain spool makes more bullets
than a person could shoot in a reasonable time. Core casting is
possible, but very tedious with such tiny core diameters.
The LED-2 outfit uses a standard .44/.45 caliber lead core, cast
in a .365-inch diameter core mould. You can also use a cast .38
bullet, if you wish. Cast these more reasonable sized slugs, and then
put them into the mouth of the extruder die. Run the press ram forward
with the extruder punch screwed into the press ram. Adjust the die so
that you can easily apply enough pressure to spurt lead wire out the
end of the die, like toothpaste from a tube.
The extruder die comes with die inserts for making .20, .17, and
.14 caliber wire. The insert can be changed easily. Lubrication on
the cast slug is essential for easy operation. This outfit is made to
extrude soft lead only. Hard alloys usually don't extrude well in a
hand press or, for that matter, a power press. I would not own a set
of sub-caliber dies without the LED-2 outfit to make my own sub-cal
wire. It is more economical, easy and satisfactory that any other
method except perhaps for buying a spool of wire to pass on to the
grandchildren (especially in .14 caliber).
Dual diameter bullets can be made in a special order die that
combines the functions of a core seater and a draw die. I don't even
have a catalog number for this one, but just call it a special. It
fits the press ram like a core seater, but has a dual inside diameter.
It acts like a draw die, in that you press your finished bullet into
the die and the forward portion is reduced by the depth of the rifling
(usually about 0.008 inches total reduction). A punch matching the
ogive pushes the bullet back out on the ejection stroke of the press.
This kind of die is somewhat expensive to produce, and is never in
stock (being made specifically for experimental applications and custom
bullets), but it does allow certain advantages over a conventional
bullet design. First, the reduced nose section rides atop the rifling
and reduces friction in the barrel. This means you get higher speeds
and less pressure at maximum loads. Second, the amount of reduced nose
section is adjustable so you can set your own freebore, even in a gun
without any barrel freebore. It is like having a non-rifled, bore-
sized guide section built on the bullet instead of in the gun barrel.
The advantage is that you can retain the accuracy you need, yet
still get higher powder charges and more velocity, and at the same time
you can use a heavier or longer bullet than the gun and cartridge would
normally feed and chamber. Feeding through the magazine is a different
problem: this doesn't help in that department. But feeding into the
barrel is no longer a problem in regard to the amount of freebore in
your gun. If the bolt would not close before because the rifling came
up against the longer bullet too soon, you can make it work now.
For want of a better name, I just call this a "dual-diameter" draw
die. We also make point forming dies that swage the bullet with a dual
diameter. There are some problems, however, that keep this from
working in all cases. One is that the seated core and jacket are one
diameter, correct for the shank of a normal bullet. Yet, the forward
part of the point forming die is undersized by so much that it is like
using the wrong caliber, and the bullet can stick or be very difficult
to eject. This happens when the reduced portion extends back very far
from the ogive.
There are many special instances where experimental processes work
very well in one instance and not at all or with great difficulty in a
similar but slightly different case. When possible, stick to the
proven and tested sets of dies: they have great versatility just as
they are. But if you do need something special and don't mind the
extra cost involved in working out the details to make it work for your
case, Corbin is one of the few places in the world where you can get
expert assistance at reasonable cost.
CTJM-1-M Copper Tubing Jacket-Maker Set, Mity Mite
A special set of dies that forms 0.030-wall hard drawn, straight
copper tubing into bullet jackets with flat bases. The bases are not
completely closed, but are nearly so. Partitions cannot be formed in
the jacket material itself, but can be made by using a smaller caliber
jacket telescoped inside the tubing. This technique works well and is
described in "Rediscover Swaging". Tubing jacket-makers are practical
for calibers from 7mm to .458 in the Mity Mite system.
LED-2 Lead Extruder Die, Mity Mite
A special sub-caliber extruder die set that makes wire for the
.14, .17, and .20 calibers, using either a .38 cast bullet or a cast
core from a .44/45 core mould (or cut wire of .365-inch diameter). All
three calibers of wire are made with the standard set, without ordering
any special parts.
JRD-1-M Jacket Reducing Die, Mity Mite
Can be ordered for either jackets or bullets, within practical
limitations. Popular use is for turning a .357 into a 9mm bullet, or
for reducing a .44 jacket to .41 caliber. Specify starting diameter,
send samples to help the die-maker adjust the die, and specify desired
final diameter. Without samples, it is impossible to guarentee the
final bullet diameter closer than about 0.002 inches. With samples,
diameter can be held to better than 0.0005 inches.
RFJM-22M Rimfire Jacket-maker, .224, Mity Mite
This is the functional equivalent of the same die in the reloading
press (RFJM-22R). It turns fired .22 cases (short, long, long rifle,
or Stinger) into excellent .224 caliber jackets by drawing out the head
and reducing the diameter. The only difference between this die set
and the one for the reloading press is the punch. The Mity Mite
version uses a punch that screws into the ram, and the die screws into
the 7/8-14 TPI press head just as it would in a reloading press.
RFJM-6MM Rimfire Jacket-maker, .243, Mity Mite
This is the functional equivalent of the same die in the reloading
press (RFJM-6MR). It turns fired .22 LR or Stinger cases into preforms
to make a 6mm jacket. The final forming takes place as the core is
being seated, expanding the drawn case to 6mm diameter from the .225-
inch diameter body typical of a fired .22 case. The head is drawn
until it becomes a smooth 0.219-inch section, but the rest of the case
is NOT pushed through the die. This is different from forming a .224
jacket (because the .224 requires that the whole case be pushed through
the die). A two-diameter ejector rod presses the partly-drawn jacket
back out of the die.
PUNCH-M Mity Mite Punch
To order a punch for any Mity Mite die, specify the caliber, the
function (CS, CSW, PF, etc.), and whether it is internal or external.
External punches fit the floating punch holder. Internal punches fit
inside the die and the ram of the press. They are the longer punch
with the small tail on one end.
.he CHAPTER 13 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
SWAGE DIES OF THE HYDRO-PRESS SYSTEM
Hydro-press dies are huge. They are larger than the ram of the
Mity Mite press and their punches are like night sticks, so big they
could just about replace the Mity Mite ram. Naturally, there is no way
they would "interchange" with dies from a hand press or the Mity Mite.
The reason for making these large dies is to withstand super-high
pressures -- pressures that would blow a firearm to bits. For
instance, a .224 caliber die in the Hydro-press design can withstand
176,667 psi repeatedly. Even the huge .512 caliber die can take
pressures of 102,198 psi. These pressures would crack a smaller die
immediately.
Because these dies can withstand such monumental pressures, it is
possible to do things with them that were not possible before in home
swaging. In fact, things that are impractical for any of the major
bullet plants can also be done easily at home because of the design of
both the dies and the press.
The same dies that are made in the Mity Mite are also produced in
the Hydro-press system. Turn to the chapter on Mity Mite dies for a
list of all the styles and sets you can obtain, and what they do. Just
replace the -M at the end of the catalog number with a -H, and you have
a catalog number for the same thing in the Hydro-press system.
For details on the operation of each of the various kinds of dies,
I will refer you to the section on Mity Mite dies. The operation is
basically the same, except that much greater pressure can be used
safely in the Hydro-press die than is possible in the Mity Mite.
Hydro-press dies also fit into the Mega Mite press, but it isn't always
practical or even possible to develop enough pressure to form the
bullet. The Mega Mite is strong enough and so are the dies, but some
calibers, materials, and designs simply require a full-power hydraulic
system in order to operate properly. On the other hand, many bullets
can be made in the Mega Mite, including lead .50 calibers and jacketed
.458 calibers with up to 0.030-inch wall tubing.
There are special dies that the great control and power of the
Hydro-press can utilize. One is the LED-1 Lead Extruder Die set. This
extruder makes any size of lead wire, from the .224 to the .458 caliber
size. Four standard LED-D inserts are provided (.185, .250, .312, and
.365-inch diameters), and you can order any other standard diameter you
need, or have a special diameter made to order.
The LED-1 comes will instructions for use. Basically, the die
replaces the floating punch holder in the press head. It accepts a
0.795-inch diameter lead billet four inches long. Corbin makes
packages of four such billets under the catalog number of LB-4, from
pure chemical lead. The kit also comes with a set of two mould tubes
and a base, which lets you cast your own soft lead into proper-diameter
billets in rapid order. Extra mould tubes can be ordered by name.
A special, long punch assembly with floating head screws into the
press ram. This punch self-aligns with the die bore, and is a very
snug fit. I don't recommend pushing it in by hand, because it can be
difficult to remove. To extrude lead wire, simply lubricate the lead
billet with Corbin Swage Lube, and drop it into the top of the extruder
die. The punch and die should be adjusted so that the punch is just
inside the die mouth, and it will support the lead billet.
Then, place the desired diameter of die insert (LED-D) carefully
in the top of the die body, with the smooth, dished side toward the
lead. Slide it into place in the top of the die. Then screw the
bushing down into the top of the die body to hold the die in place.
Start the press moving up. Normally, I like to adjust the top position
sensor so that the ram is just short of the top of the die when the
press stops. This is best done by running the ram up before the die is
installed, then screwing the die down until it stops against the punch
face, and finally backing it off slightly for clearance. Then set the
location of the top sensor to shut off the press and reverse it at this
point in the ram travel.
Small diameter wire can take 1,800 psi or so to extrude. Larger
diameters can take as little as 1000 psi on the press gauge. The exact
pressures are suggested in the literature that comes with the LED-1.
When you start up the press, lead will come out the top of the die
quickly. It will be hot, so don't immediately grab it with a bare
hand. Trapped air or lube can cause bits of lead to be expelled with
great force from the top of the die, so never lean over the die or
place any part of your body over the top of it while you are extruding
lead. If you ever observe this rare occurrance, you will be careful to
follow that advise.
The quality of wire that you can produce this way far exceeds
nearly any commercial supply. It looks like chrome, and it is so even
and consistent that it is hard to believe the material is soft lead.
Many Corbin customers sell their lead wire at a premium price, and get
it, because it is indeed a premium product.
Copper tubing jacket-maker dies, CTJM-1-H, for the Hydro-press can
be ordered in .030, 0.049, or 0.065-inch wall thickness. Brass,
copper, or even steel jackets can be formed. In copper of 0.030 and
0.049 wall thickness, it is practical to form a partition or wall
across the middle of the jacket in several of the larger calibers.
This isn't possible or practical in all calibers or wall thicknesses,
but generally works well above .30 caliber in 0.030 wall copper tubing,
and with most of the larger calibers in 0.049 wall copper tubing.
The base closure that is possible with the Hydro-press die set is
total, in flat base designs. Recently, we have developed methods of
making nearly total closures in a rebated boattail, copper tubing
jacket. Solid noses can also be formed to a high degree of closure.
Bullet designs that far outshine any conventional factory design can be
produced at home. Hundreds of fired bullets, recovered from trophy
game by excited customers, line the shelves in my office. Their
performance all over the world, time and time again, proves that a
person can produce a better bullet in his own garage or loading room
than most of the very expensive factory bullets available today.
JRD-1-H Jacket Reducing Die, Hydro-press
Available for tubing reduction, bullet drawing, or jacket redraw
operations. Also used for reducing the diameter of pieces of cut,
solid tubing in copper or brass alloys, in order to produce solid metal
bullets for special applications. The JRD-1-H fits a 7/8-14 to 1.5-12
thread adapter in the press head, and the punch screws into the press
ram. For unusual applications, automatic stripper plates and guide
frames can be built to fit on the CHP-1 Mark IV Hydro-press, quickly
removing the drawn component from the punch on the down stroke and
allowing rapid, hand-fed operation that approaches automatic feed
production (at a fraction of the cost).
CTJM-1-H Copper Tubing Jacket-maker, Hydro-press
Normally used in calibers above .308, up to and including the .600
Nitro, special sets can be used in calibers such as .270 and 7mm.
Usually, smaller calibers can utilize commercially available jackets at
lower cost, or use commercial jackets reduced in diameter to thicken
the walls. Wall thickness of 0.030, 0.049, and 0.065 are standard in
the larger bores. Special sets can be made for other wall thickness
tubing. The flat-base sets round the end of the tubing, draw it down
to proper size, and flatten the end in the regular core seating die of
your swage set. The partition sets utilize two punches to fold and
pressure-weld a band between their ends, making a partition in the
middle of the bullet (exact position can be set by punch length
ratios). The base is rolled over after the core is inserted. Two
short cores are inserted, one from either end. Partition sets are the
same price as regular sets, although different kinds of parts are
included. Five punches are normally used to convert a conventional
flat base set into a partition set. Rebated boattail sets can be
produced as well, again at the same price. RBT and partition designs
are not usually combined.
CSW-1-H Core Swage Die, Hydro-press
The core swage makes precise lead cores from soft or hard lead.
Unlike the Hydro-press dies, there is no restriction on lead hardness.
Special diameter bleed holes are utilized to produce a soft or a hard
lead swage die. Specify which kind of lead you wish to use when
ordering, in order to get optimum performance.
CS-1-H Core Swage Die, Hydro-press
The core swage die can make a semi-wadcutter handgun bullet with
or without a jacket, or it can be used as a preliminary step in forming
a rifle bullet (where the final stage is the point forming die).
Pressure limits for each caliber of die are given in the book, "Power
Swaging". Punches can be ordered by function and shape under that
catalog number PUNCH-H (for this and all other Hydro-press dies).
PF-1-H Point Form Die, Hydro-press
The point forming die has the actual bullet shape lapped into its
cavity. It can form both jacket and lead into the ogive, unlike the
straight wall core seater which uses a punch to shape just the lead
nose. The internal punch is a tough spring-steel ejection wire.
Larger calibers normally use a wire that can be 0.180 to 0.200 inch
diameter. This assures easy ejection on lead tip bullet designs.
Smaller calibers normally utilize wires of 0.120 or less, down to as
little as 0.080 inches for very small caliber bullets. It is important
to know the ejection pin diameter and length so you can order
replacements easily. One of the first measurements you should record
is the diameter and length of the wire part of this punch, just in case
you ever need a replacement sent quickly.
LT-1-H Lead Tip Forming Die, Hydro-press
The lead tip die shapes the extended lead tip of the bullet, and
it can also be used to close down the open tip of a bullet below the
diameter of the ejection pin (as discussed under the PF-1-H heading).
The internal punch of this die has a cavity that determines the
tip shape. You can order extra internal punches to make flat nose,
spitzer tip, or semi-spitzer (rounded end) tips. This die uses the
same external punch as the point forming die, and cannot be used
without first having a point forming die of the same caliber. It does
not come with external punch for that reason.
RBT-2-H Rebated Boattail Add-On 2-die Set, Hydro-press
This set ounch of this die has a cavity that determines the
tip shape. You can order extra internal punches to make flat nose,
spitzer tip, or semi-spitzer (rounded end) tips. This die uses the
same external punch as the point forming die, and cannot be used
without first having a point forming die of the same caliber. It does
not come with external punch for that reason.
RBT-2-H Rebated Boattail Add-On 2-die Set, Hydro-press
This set o The combination of a core swage with bleed holes and the base and
nose forming punches of a semi-wadcutter or paper-patch rifle core
swage die makes this die. The weight is adjusted and the nose and base
formed all in one stroke. The die is used to make lead or half-
jacketed handgun and rifle bullets. Typical rifle ogive would be a
nose punch having a 1-caliber long, eliptical shape. Typical handgun
nose shape might be a Keith or wadcutter. Other shapes can be made to
order. Standard shapes include conical, Keith, round nose, wadcutter,
or hollow point, and flat base, cup base, dish base, and hollow base
shapes.
JSWC-2-H Jacketed Semi-wadcutter 2-die Set, Hydro-press
This set breaks up the operation of weight adjustment and final
sizing into two steps, making it possible to use 3/4-jacket lengths.
It can also make lead or half jackets. Since bullet noses and bases
are formed by pressing against punches, there can be no curve or radius
of the jacket away from full bore diameter. The nose must be formed
entirely of lead, with a small step between the end of the ogive and
the start of the shank, also formed in the lead extending beyond the
jacket.
FJFB-3-H Full Jacket, Flat Base 3-die Set, Hydro-press
The 3-die set described under the Mity Mite section is also the
basic set for the power press. Any caliber from .14 to .72 (or so)
diameter may be ordered. Standard calibers for every conventional
factory bore size are available, though demand is quite high and
delivery times depend entirely on the current backlog: call or write
to get a copy of the immediate delivery list.
LTFB-4-H Lead Tip, Flat Base 4-die Set, Hydro-press
Lead tip bullets or open tip styles can be made with this set.
Generally, the lead tip styles are for rifles, because a blunt handgun
ogive can usually be formed with a lead tip even without the special
lead tip die. Sharper ogives require the extra die to shape up the
lead tip after the actual ogive is formed.
RBT0-4-H Rebated Boattail, Open Tip 4-die Set, Hydro-press
The open tip, rebated boattail is a favorite amount competition
rifle shooters and is rapidly becoming popular among winning metallic
silhouette shooters who use long range handguns. The rebated boattail
can be made in copper tubing jackets in the Hydro-press. Hard alloys
are also feasible with these high pressure dies and the press that
"thinks" so it can avoid over-pressure conditions when properly
programmed.
RBTL-5-H Rebated Boattail, Lead Tip 5-die Set, Hydro-press
The five die rebated boattail, open or lead tip rifle set is
popular among shooters who take their firearms afield as well as to the
range. Choosing a lead tip offers greater expansion than the same
weight of open tip (and most people think it is the opposite!). The
open tip bullet brought to a small meplat (typically less than 0.1
inches in diameter at the bullet tip) brings a considerable thickening
to the jacket tip. Many factory bullets that were advertised as being
0.049-inch wall thickness showed over 0.060 inches at the tip as a
result of this unavoidable thickening when the jacket is drawn to a
point. Using the lead tip gives you a greater opening at the actual
jacket's end, since the lead extends beyond it to serve the purpose of
a smaller tip for better ballistics. It is the jacket thickness and
opening size that controls expansion, rather than the mere fact of
whether or not the tip is open.
FRB0-5-H Flat or Rebated Boattail, Open Tip 5-die Set, Hydro-press
A set for the person who likes open tip (which is NOT the same as
hollow point, no matter what some of the mass producers of bullets say
in their literature) bullets, but wants the widest possible range of
weights. Many people purchase an extra point forming die, as well,
getting a 6 or 7-S ogive for their longer range target work and for
more conventional weights, then getting the extra PF-1-H in a 1-E or a
round nose ogive (.5-E or .5-S -- it is the same thing) for both the
very light weights (short shank and short nose) or the very heavy
weights (long shank, short nose). The advantage of the blunt ogive is
that it gives you a greater range of useful bullet weights. The
advantage of the sharper ogive is less drop and higher delivered
velocity over a given range.
FRBL-6-H All Style System, 6-die Set, Hydro-press
Finally, the set that gives you everything. This set makes all
the styles of any of the other sets, except that you would need to
order extra punches (PUNCH-H, External, specify caliber and shape) to
make semi-wadcutter noses in the core seating die. Naturally, it
doesn't make every possible ogive shape, since the ogive is controlled
by the cavity lapped into the point forming die. Various ogive curves
would be made by ordering extra PF-1-H dies made in those shapes.
Usually one or two shapes will suffice for the widest range of hunting
and target shooting situations.
LED-1 Lead Extruder Die Set, Hydro-press
The lead extruder die set has a large heat-treated steel body that
fits into the press head, a long floating punch or piston assembly that
fits snugly into this die, a series of four die inserts which control
the diameter of the lead wire you can extrude, a bushing to hold the
die insert into the top of the die, a pack of lead billets, and a mould
base with two mould tubes to make your own billets from scrap lead, if
you wish. Standard sizes of .185", .250", .312", and .365" die inserts
are included. Others can be ordered in any desired size down to .125"
(which is the smallest size this extruder can safely produce --
pressure and system size increase with the reduction in wire diameter).
LED-D Lead Extruder Die Insert, for LED-1
The die insert for the LED-1 is a heat-treated button which is
about three-quarters of an inch long and equally broad, made to fit
precisely into the top of the LED-1 extruder. Corbin also makes
various kinds of wire drawing dies for major lead wire manufacturers
and others involved in defense or sporting ammunition manufacture. You
can order a standard size for a caliber, or you can specify a custom
diameter. Lead wire diameters depend both on the hole size in the die
and on the extrusion velocity and ambient temperature, the lubrication
used and the particular alloy being extruded. If the application is
critical, it may be necessary to purchase a set of dies in 0.001-inch
increments to adjust the size to your conditions and materials.
LB-4 Lead Billet, Pack of 4, for LED-1
Corbin has pure (99.95 percent) lead billets in 0.795-inch
diameter, four inches long, sealed in packets of four. A complete set
of specifications is included with each packet. A simple Brinnell
hardness test can be made using a steel ball, a vise, and these known
hardness cylinders of lead. Details can be found in the Corbin
textbooks.
RLA-1 Reloading Adapter Kit, Hydro-press
This is one accessory I would consider necessary with any Hydro-
press. You would be amazed at the number of times you'll find yourself
putting regular type 7/8-14 dies and shell holders of the RCBS type
into your Hydro-press. It is so fast and easy to set it up for power
case sizing and depriming, using the automatic cycle. Case forming,
military case conversion, depriming crimped primers, and other tough
jobs that put a strain on your progressive press are trivial jobs for
the Hydro-press. The bushing from the RLA-1 is required on JRD-1 type
dies, which makes it possible to use your Mity Mite or Reloading Press
draw dies, along with a different punch, in the Hydro-press. Come to
think of it, you can use a reloading press punch, too, with this
adapter kit. (The longer Hydro-press punches are sometimes more
convenient, however.)
RLA-50 .50 BMG Shell Holder, Hydro-press
The .50 caliber 1-1/2 inch threaded dies that CH and RCBS make
screw directly into the head of the Hydro-press. Using the reloading
adapter kit, you can screw this large shell holder directly into the
ram extension that is part of the kit. Primers are shunted to the side
and out an exhaust port in the side of the extender. If you load the
.50 Browning Machine Gun cartridge, this is a handy accessory.
RFJM-22H Rimfire Jacket Maker, 224 cal., for Hydro-press
Why not automate the making of free .22 jackets? With the CHP-1
Hydro-press set for an automatic stroke cycle, you can slip cases over
the punch and let the press shove them all the way through the die and
out the top in one stroke. It certainly is more fun than doing it by
hand!
RFJM-6MH Rimfire Jacket Maker, 6MM cal., for Hydro-press
The 6mm or .243 caliber (also .244) jacket maker utilizes long
rifle or Stinger cases to make 65 to 70 grain bullets. A special JRD-
1-H die and punch set can be made to draw .22 Magnum cases to 6mm or
.257 (undersized, but they expand nicely in the core seating
operation).
SPJM-25H Shotgun Primer Jacket Maker, 25 ACP cal., for Hydro-press
For 50 grains and less, a spent shotgun primer cup can be made
into a good jacket for the .25 ACP or the .25-20, .256 Winchester, or
other light-weight quarter-inch bore. The .25 ACP uses a .251-2"
bullet and the .25 rifles all use a .257" bullet, but the same jacket
diameter works for making either.
.he CHAPTER 14 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
CORBIN SWAGE PRESSES
There are three presses currently made by Corbin for bullet
swaging. These are the Mity Mite press, the Mega Mite press, and the
Corbin Hydro-press. They are discussed in detail in previous chapters.
The operation of the Corbin Hydro-press is discussed in the book,
"Power Swaging", D. Corbin.
On special order, Corbin has built air presses and other custom
machinery for military and special ammunition manufacturing operations.
Whenever possible, I would suggest that you consider the Hydro-press.
This machine will handle nearly any kind of job you have now or in the
future. The cost of building special, one-of-a-kind versions of some
other design, even if it appears to be quite a bit more simple, usually
involves enough set-up and development time that a person would have
been better off financially to purchase the more versatile standard
product.
A great many ideas which have merit also have development and set-
up costs associated with them, which make them less economical than a
person would imagine in comparison to a well-developed standard
product. I mention this because I am constantly asked to build or at
least to quote on modifications to reloading presses, adding power to
the Mity Mite press, building dies that would fit into some punch press
or home-made press, etc.
The design of the press used for swaging has to be closely matched
to the punches and dies, not only the ones made today but the ones you
might need in the future. Years of consideration have gone into the
design of the present systems, in order to make them true systems which
work together, have replaceable components, and have as much
interchange as it is practical to obtain between various operations and
tools.
While another press might be perfectly suitable to the one job at
hand, when one looks down the road a little way, it becomes evident
that most special designs and modifications to other presses have
built-in problems with replacement parts, expansion to new products,
and versatility. Basically, why re-invent the wheel every time you
need something different, when so much time and thought has already
been put into developing swaging systems that can grow with your needs?
It stands to reason that if a company makes thousands of identical
punches and dies, it will cost far less for much higher quality than if
they had to stop, figure out what you need this time, and build it all
from scratch. In the Corbin systems, we have combined a degree of
custom adaptation to your needs with a base of standard components and
dimensions. Thousands of blanks, semi-finished parts, are run in
production. Hundreds of them are turned into standard sets in the
popular calibers. Then, custom orders are filled using the standard
dimensions and materials with which the die-makers have become so
familiar.
Rather than starting from scratch each time, your custom order is
based on generations of accumulated experience and semi-finished,
standard blanks that can be more quickly finished to the exact shape
and size you need without distrubing the versatility of the system.
The popular magazines often state that Corbin's major contribution
to the shooting industry has been the development of a wide range of
swaging products and hundreds of articles on swaging techniques. I feel
that the most important single thing we have done for shooting has been
the development of the semi-custom production method, where most of the
benefits of mass production are retained, and most of the benefits of
totally hand-made, custom products are still realized.
Small wonder that Corbin has been swamped with orders for over a
decade, with no end in sight. Prices are kept in the mass-production
range, but the results are custom made with skilled die-makers working
one-to-one with you on your order. When I hear someone offer an
improvement, I listen... but looking at the whole picture, I think the
general welfare of most shooters is served well by the present course.
CSP-1 Corbin Swage Press, Mity Mite Model
The Mity Mite is a 2-inch stroke, balanced torque swaging press
with horizontal ram, having the die in the ram and the external punch
in a floating punch holder in the press head. This arrangement,
together with the geometry of the ram and punches, permits self
ejection on the back stroke.
The CSP-1 press takes a die with 5/8-24 TPI thread, which screws
finger-tight into the ram. The external punch is held in the floating
punch holder (in the press head) by means of a hexagon-flanged threaded
bushing, which slips over the punch and presses against its head. The
floating punch holder and details of press operation are covered in the
prior chapter on the Mity Mite system.
CSP-2 Corbin Swage Press, Mega Mite Model
The Mega Mite is a long-stroke, balanced torque swaging and
reloading press, built to accept reloading dies and shell holders, Mity
Mite dies and punches, and Hydro-press dies and punches. Various
adapters and inserts change the press to suit the kind of dies being
used.
The Mega Mite is quite possibly the strongest and most certainly
the most precisely built hand press available for the handloader today.
It is machined from steel, with the ram moving on bearings against
hardened and ground guide rods. While it cannot substitute for the
power and stroke control of the electronically controlled Hydro-press,
the CSP-2 fills a need for those who wish to manufacture bullets just
larger than the sizes which the CSP-1 can handle, or in harder alloys
than are recommended for the CSP-1 dies.
Because many other reloading manufacturers have concentrated on
progressive type presses, most of which do not have the strength or
simple rigid design features required of a heavy-duty reloading press,
the CSP-2 finds use as the ultimate hand press for the advanced
handloader as well as a premium choice for the person who wishes to
invest in only one universal handloading press.
CHP-1 Mark IV Corbin Hydro-press
The Hydro-press (trade-marked name of the CHP-1 series) has gone
through four generations of development. The current model (Mark IV)
incorporates all the features of the earlier models, plus electronic
proximity sensing transducers and pressure transducers, solid state
dwell time control, and accuracy far beyond the ability of an ordinary
hydraulic or manual press.
The great power of this system is secondary to its precision
control. The ability to precisely set stroke length, maximum pressure,
the time the pressure will be held, the speed with which the ram will
move, and the point of ejection of the bullet (as well as the stopping
position for loading in another component), is coupled with programmed
stroke cycles that offer manual, one-stroke, or automatic stroke modes.
Even the various modes offer programmable methods of determining
how the component will be formed. Operations which depend upon precise
volume generation use electronic position sensing and stop when a
precise volume has been achieved in the die. Operations which depend
more on accurate pressure levels use the built-in pressure transducers
to apply a pre-set level of pressure and then hold it for a pre-
determined length of time before backing off the ram and ejecting the
part.
The ram can be set to move like the hour-hand of a clock, for
set up of a new operation. Then, the throttle control can be adjusted
for ram velocity of up to 120 inches per minute -- faster than any
conventional electric hydraulic system of 20-ton capacity, capable of
operating from ordinary household current. The secret is the multiplex
or time-shared technology that makes the system appear to be developing
impossible efficiency from the 1.5 HP motor, gaining both speed and
pressure out of proportion to the power used.
Since swaging only requires maximum power at the end of the
stroke, most operations utilize the high speed only to move the ram
into position and apply the first 500 psi of drive pressure. If the
system calls for more than 500 psi drive, then the second pump takes
the load and moves up to 2000 psi more pressure into the lines. Since
the movement has already been handled by the high-speed pump, the
automatic pressure switching circuits make the press appear to be
running at both high speed and high pressure at the same time.
Actually, the system switches from one mode to the other instantly, and
is only using the exact amount of power required to handle either one
or the other.
The drive line pressure is multiplied 8.3 times by the system
before being applied to the swage punches. A drive line pressure of
only 1000 psi produces 8300 pounds of ram force. The ram force is
further multiplied by being channeled through the punch face area,
which can result in pressures well over 170,000 psi inside of the swage
die. A chart of pressures in the dies for a given gauge pressure on
the CHP-1 can be found in the book "Power Swaging".
EX-10 Lead Wire Extruder
This machine is not a swage press, but a special purpose lead wire
manufacturing machine for commercial operators. It is one of the most
economical and versatile extruders available today, costing a fraction
of what most lead plants have had to invest in their machines. For
making spools of 1, 5, or 10 pounds of lead wire, hollow core fishing
wire, or special extruded shapes for stained glass work, the EX-10 can
serve as the basis for a profitable home business. Utilizing a 2-inch
diameter billet, the EX-10 operates from 220 volt single phase 60 Hz
power (using the same kind of electricity as a standard electric dryer
or range in the USA -- special versions can be built for 50 Hz or 3-
phase operation).
The ram automatically advances into the huge extrusion die, and is
controlled by pressure transducers. When the pressure reaches a preset
safe level at the end of the stroke, the ram reverses and retracts from
the die. If anything should cause the system to meet undue resistance,
the ram will reverse and back out of the die. At the full extent of
the back-stroke, the ram stops and the system goes into idle state
again, waiting for another billet to be inserted.
Lead extruded from the EX-10 can be coiled or cut as it comes out,
in order to make convenient packages. Extrusion rate is fast enough to
be practical, yet slow enough so that it is easy to handle the output
without expensive high speed coilers and feeds. Even a simple hand-
wound bobbin is adequate. The billet size and machine design are
suitable for one-man handling and operation. Unlike larger machines
which use billets too large for safe handling by one person, the EX-10
makes a compact package for the garage operation.
.he CHAPTER 15 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
ACCESSORIES FOR THE HYDRO-PRESS
The Hydro-press comes with a standard floating punch holder, a
tank of hydraulic fluid (you may need to add a little), and the USA
models comes with a standard 115 volt power cord. Export models come
with a power cable but without a plug, or with a plug matching a
standard US 3-prong 220 volt outlet (which may have to be replaced with
a plug meeting conventional standards for the country to which it is
exported).
The machine is designed to operate with Corbin swage dies of the
Hydro-press type without any optional accessory items. The external
punches fit into the punch holder and the dies with their internal
punches screw into the press ram. There are a number of items which a
commercial operator would be wise to have on hand, either as spare
parts or as accessory supplies to increase the versatility of the
machine.
FPH-1-H Floating Punch Holder, Hydro-press
One comes with the press. Having extras with the punch installed
and a locking nut secured makes it possible to pre-set commonly used
punch depths for quick installation. One can also order this unit with
a hole and retainer bushing size for 12 gauge shotgun and other larger
calibers (70 caliber and up). Specify the "shotgun" version. The
regular punch holder does not work with huge 12 gauge and larger
punches.
A-220V 220 Volt Power Option, Hydro-press
For use on 50-60 Hz single phase 220 volt current, which is
standard line voltage in many countries besides the United States, one
should order the Hydro-press with this option factory installed.
Conversion in the field is NOT recommended, although a qualified
electrician can do it with the correct components. The conversion
includes an internal transformer so that the standard 115 volt
indicator lamps and electronic circuits can still be used (one does not
need to purchase special 220 volt bulbs, etc., for the machine after
the conversion).
RY-1 Logic Relay, Hydro-press
There are a number of logic relays in the Hydro-press to control
various functions. They are highly reliable and interchangable, so
that it is easy to troubleshoot a potential defective relay by changing
it with one of the others to see if the problem goes away or shifts to
another function. It is a good idea in isolated areas, or for critical
schedules, to have at least one spare logic relay on hand "just in
case". Logic relays plug into sockets in the Hydro-press. They only
go in one way, so it isn't possible to put them in "backward".
PUNCH-H Punch, Hydro-press
As with the other swaging systems, the Hydro-press system can be
expanded to other operations by adding optional external or internal
punches to an existing die set. To order any punch, as a replacement
or spare, or as a new option, use this catalog number, followed by the
caliber, whether INTERNAL or EXTERNAL, the kind of die it works with
(such as CS-1, PF-1, etc.), and any special face shape or diameters
that are needed to make it work for your application (as, Keith nose,
or diameter to fit inside sample jacket provided with order).
TDL-1 Timer Module, Hydro-press
An electronic timer module, also known as a time delay relay,
controls the dwell time at the top of the Hydro-press stroke. You can
adjust it for any desired dwell, from milliseconds (0.001 seconds) to
several seconds. A top-panel knob gives you immediate control of the
dwell time on mid-1986 and later models. The solid-state electronic
module is very reliable, but it is easily changed by plugging in a new
unit if trouble should ever develop. In critical or isolated
situations, a spare module is a good idea.
PDX-1 Position Transducer, Hydro-press
The electronic position transducers are sophistocated proximity
detectors, which sense the position of the ram by the near-field effect
of a magnetic detector circuit inside the unit. These small threaded
cylinders hold a considerable amount of electronic circuitry, and are
highly reliable. A red LED indicator shows you if the unit is working
by lighting when steel objects come close to the sensor face.
There are THREE of these transducers on the mid-1986 and later
model Hydro-presses, replacing the earlier Micro-Switch roller-arm
limit switches. They offer remarkable accuracy and ease of adjustment
-- simply slide them up or down their steel standard to set the top,
bottom, and loading positions for the press stroke. However, if you
should happen to physically set the transducers too close to the ram,
you can run the ram into one and smash it. Replacement is moderately
easy: remove the back cabinet cover, and trace the shielded cable from
the broken transducer to the terminal strip on the logic board. Loosen
the screws and remove the wires from the unit to this terminal strip,
and replace the new transducer with the same connections.
If you are careful not to adjust the transducers forward so they
obviously are in the path of the moving ram guide plate, this damage
will never happen. It is not really necessary to adjust the position
horizontally at any time. Vertical adjustment is made by sliding the
transducer up and down on the standard, in its slot. Finger pressure
is all you need to hold the transducer locked in position with its
locking nut. This is a spare part that probably won't need
replacement, but in very remote areas and critical applications, where
being out of operation for a week or ten days would cost more than the
transducer, it is a good idea.
SV-1 Solenoid Valve, Hydro-press
The main hydraulic control in the press is the 4-way electric
valve that switches oil flow direction in and out of the drive
cylinder. This valve usually has a very long life, but can be damaged
by contamination in the hydraulic fluid, incorrect kind of fluid, chips
or dirt in the fluid, or normal wear. Since it takes about 30 minutes
to remove the old valve and install a new one, the first time, it isn't
a troubleshooting technique to do this routinely and spares are usually
a good idea only if the application is very critical. The main symptom
of a bad valve is erratic movement or variation in speed from stroke to
stroke, loud noises from hydraulic fluid vibrating as it tries to move
past a partly stuck valve opening, failure to stop at the top or bottom
position of the stroke, and other failures related to ram movement or
speed that are erratic in nature or produce accompanying loud noises.
A defective solenoid valve does not cause harm to the press, and
can be operated if you can put up with the symptoms. But one failure
mode (where the valve sticks in position instead of switching every
time) can cause the press to continue upward when it should be stopped,
and this can cause a problem (such as extruding all the lead out of the
core swage die instead of making the right weight of core!).
Fortunately, such problems are extremely rare. The solution is to
remove the valve and replace it.
Solenoid valves do not require removal of any plumbing for
replacment. They are mounted on a sub-plate which carries all the
steel tubing and ports. The valve control wires (4) unplug from the
rest of the system using a very obvious connector that you will see
when you open the cabinet and trace the wires out of the solenoid
valve. A cover plate on top of the unit removes (with corner screws)
to expose the box that holds the wire connections and also gives you
vertical access to the corner scews that hold the valve on the sub-
plate.
Removal of these corner screws allows you to lift the valve
straight up, off the sub-plate. A small amount of oil will trickle
out, but as long as the pump is turned off there will be no need to
worry about a flood of hydraulic fluid. There are four o-rings on four
recessed port openings beneath the valve, which you must make sure are
not lost. Other than that, replacement is as simple as unplugging and
unscrewing the old valve, and putting the new one in its place.
Since this component is moderately expensive, and is kept in
stock, it is not something that most people need to stock as a spare.
The ends of the coil housings contain a movable manual plunger that
shifts the valve so you can test the operation. If a symptom appears
that you suspect is related to a sticking valve, press on the center of
one and then the other end cap (solenoid valve covers) with a small
dowel to push the valve spool and help it shift into correct position
while the press is trying to run. If this cures the problem then the
valve is probably at fault. The right end to push depends on which
direction the press is running. One must be careful not to reach into
the top panel electric wiring while fooling around inside the cabinet
-- we recommend bringing in a qualified electrician for any internal
service work.
CHF-128 Corbin Hydraulic Fluid, Gallon Can
Spare fluid is handy if you should ever need to replace a fitting
or if you spill fluid while moving the press. If the press isn't
tipped too far, but is kept vertical while moving, it should not spill
any fluid. Fluid lasts for years in a typical operation without undue
contamination. Condensed moisture, bits of metal powder from natural
wear of the pump vanes and valves, heat by-products in the fluid from
long, hard use, and dust from outside the system are potential reasons
why you might want to change the fluid after a few years of operation.
A combination of temperature and oil level gauge is located right
on the oil reservoir, inside the cabinet. You can easily see if the
fluid is low or the temperature rises above the recommended maximum of
140 degrees F. Extended use at high temperature will cause the oil to
break down, and can lower the pressure you are able to generate.
Eventual failure of the cylinder and valve seals, as well as those on
the pump, result from prolonged high-temperature operation above the
recommended levels. Low fluid level leads to high temperature
operation since the oil does not have sufficient thermal mass to
transfer and adsorb the heat over the back surface of the tank (which
is designed to act as a heat exchanger with the air compression of the
dual cooling fans and air expansion during exit through the closely-
spaced exhaust grill.
IL-1 Logic Indicator Bulb, Hydro-press
Telephone-quality 115 volt indicator bulbs are used in order to
provide bright display of the status of the logic circuits. LED
indicators were not chosen here, since a clearly-visible display in
bright light was deemed necessary for operator safety. Spare bulbs are
a good idea. They are not expensive and last a very long time (typical
bulb life is over 10,000 hours). The bulbs are changed by unscrewing
the colored caps from the indicators, and pulling straight out on the
glass bulb. There are THREE IL-1 bulbs in each Hydro-press.
IL-2 Work Lamp Bulb, Hydro-press
The inspection lamp has a pre-focused ellipsoid spotlight bulb of
the R-14 type, with screw base. This bulb provides excellent
inspection lighting with low power and heat. It is a 115 volt bulb
with a long life in normal use. A spare is handy. Only one such bulb
is used in each Hydro-press.
FSO-16 Corbin Gun Oil, Pint Can
This instrument grade ISO-15 oil is highly recommended for
lubrication of the ground rods and bearings in the Hydro-press head, as
well as for preservation of the dies and punches while they are in
storage. It is a very economical product that works quite well as both
an instrument and lathe oil. Originally marketed as Five Star Gun Oil,
the pint can contains as much oil as EIGHT conventional 2-ounce cans
for about half the price.
.he CHAPTER 16 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
BULLET JACKETS
Bullet jackets are available from Corbin in popular calibers and
lengths. The current list is always available from Corbin on request.
The typical packaging is in boxes of 250 jackets for larger calibers
and lengths, and in boxes of 500 units for half-jackets, smaller
calibers, and shorter lengths.
Gilding metal jackets with very consistent wall thickness and with
an expansion controlling taper from edge to base are usually about half
the cost of a quality bullet made from the same material. In some
cases, you can save considerably more. In a few cases, you can find
surplus or low-cost factory bullets that are available for about the
same price as a good quality jacket.
In the .224 caliber, this is often the case, since many firms
contract with the government to manufacture .223 bullets and can use
much of this investment in machinery to turn out low cost .224
projectiles for reloaders. However, in the .224 market, you can also
make FREE jackets using fired .22 cases, so you have the last laugh
anyway!
Sizes and lengths that are not popular enough (yet) to be stocked
can often be made from existing calibers and lengths. Any larger
caliber can be drawn down to a smaller size in a simple draw die, such
as the Corbin JRD-1. The reduction usually is practical from .284 to
.270, from .270 to .257, and from .243 to anything down to a long heavy
.224 jacket.
Sub-calibers can be drawn from .224 jackets, and pinch trimmed to
length in the same operation. Jackets can be pinched off as they pass
through a constriction to the next smaller caliber size, by having the
punch that pushes them through the draw die made with a shoulder. The
smaller diameter of the punch, from the shoulder to the end of the
punch, is made to fit inside the reduced diameter of the jacket. The
larger diameter from the shoulder back to the base of the punch just
fits through the draw die by itself, leaving no room for any jacket
material.
A minimum reduction of at least the thickness of the jacket wall
is required to do this pinch-trim operation. But it works well and
gives you one more tool to control your jacket supply. In many cases
there is no need to reduce a jacket length as well as its diameter. A
.41 and a .40 caliber jacket can both be drawn from a standard .44
jacket, for instance. Taking the jacket down in two steps is usually
better than trying to reduce it all at once.
Copper tubing provides for a superior jacket in calibers from 7mm
up. Conventional water tubing such as type L hard drawn copper works
very well and makes bullets so accurate you would swear they came from
a custom bullet works (and, come to think of it, they DID: -- YOURS!).
Tubing normally costs more than conventional jackets unless you find a
good deal on a large lot, or have an uncle in the plumbing or
commercial refrigeration business. Typical prices at this writing are
about five cents average price for a good commercial jacket, and about
eighteen cents average price for a pre-cut and de-burred piece of
tubing.
If you cut and de-burr your own lengths of tubing, then of course
the cost can be lower. It is still hard to beat the price of
commercial jackets. Trouble is, they are not always available in the
calibers you want, and they are usually much thinner than you need for
big game. Premium quality game bullets selling for as much as $2.50
each can be reproduced for about eighteen to twenty cents, and they can
include partitions, bonded cores, selective jacket thickness, brass or
steel as well as pure copper jacket material, plus the weight and
styles you want instead of those someone else wants to make for you.
Those are some of the reasons people often choose to make tubing
jackets even when commercial ones are available at lower cost. Price
is often a secondary consideration when people get serious about big
game, defense, or competition shooting. Performance is the issue.
After all, taken to its extremes, a fellow only worried about cost
should get a slingshot: it throws a cheap projectile! When you start
saying, "...but what about accuracy, expansion, delivered energy, etc.,
", then it becomes important to start weighing these factors against
the cost of equipment to achieve them. Tubing jackets, made correctly,
can be such huge steps above ordinary jackets that cost really is
out-distanced by performance.
Corbin supplies cut pieces of copper, brass, or steel tubing in
the 0.030, 0.049, and 0.065-inch wall sizes. Cut pieces are made to
order (so they are non-returnable) for the weight and style of your
caliber. A minimum run is 100 pieces of stock material, 200 pounds of
custom material. If you do want a custom wall thickness or alloy, we
can probably get it made or make it for you, in the 200 pound minimums.
Prices typically have been running about $6 per pound with cutting and
material included, but write for an accurate quote.
.he CHAPTER 17 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
LEAD
Corbin supplies lead in several forms, including lead wire and
lead billets made to fit our extruder dies and machines. We are not a
primary supplier of large quantities of lead, however, and recommend
that you locate a lead firm near your bussiness area for large lots of
lead. If you wish to enter the extruded lead wire market, we can help
you with machinery and billet moulds, but we do not manufacture lead
pots and would recommend that you contact the cast bullet suppliers for
these.
Corbin lead wire comes in sizes that are suitable for all calibers
of rifle and handgun bullets. The size of the wire usually is much
smaller than the caliber of the bullet, since the wire is made to fit
into a jacket. Jackets are usually smaller than the caliber by a few
thousands of an inch, themselves. Everything expands upward under
swaging pressure to make a uniform, tightly fitted bullet.
Custom diameters and alloys are available on special order for a
different price than the stock pure lead in standard diameters. When
you order lead wire by caliber, we supply the size that fits into the
standard jacket for that caliber unless you specify some other size.
If you order at the standard price and catalog number, but specify a
special size, then we supply the nearest stock size that appears likely
to fit into your jacket.
Lead wire can be very economical, depending on the caliber. In
.224 caliber, for instance, a single 25-lb. spool of lead wire makes
well over 4,300 conventional 50 grain bullets (the jacket weighs over
10 grains). Even with coast-to-coast shipping, your lead cost per
bullet is about one cent. Who needs to bother with casting cores, when
you can snip off lead wire for that low a price? On the other hand, if
you already have plenty of lead, you may as well use it with a core
mould, which makes around 1000 cores an hour.
LW-25 Lead Wire, 25-lb. Spool
To order lead wire, specify caliber or diameter you need to fit
into your jacket or core swage die. Standard diameters are: .125
(1/8") for .17 caliber, .156 (5/32") for .20 caliber, .185 (3/16") for
.224, .243, .25 caliber, and thick-wall .270 caliber, .218 (7/32") for
thin-wall .270, .284, and thick-wall .308 caliber, .250 (1/4") for
.308, 8mm, and other calibers up to .338 plus some tubing jacket big-
bores, .312 (5/16") for .38/9mm, .358, .366, .375 and some big bores
with tubing jackets, .340 (11/32") for the .40 and .41 calibers, and
.356 (3/8") for most big bores except those with thick jackets.
The decimal size is the right one -- the fractional size is the
nearest size you will normally find elsewhere. Corbin makes wire to
the exact size that fits rather than to match the common fractional
diameter. However, you can use the next smaller wire in any jacket so
long as there is enough bulk to it that your desired weight doesn't
come out too long to fit into the die.
Custom sizes and alloys are available but they are not stocked and
there is an additional cost involved in making special drawing dies and
in getting a special alloy drawn. A minimum of 100 pounds applies on
any special diameter or alloy.
Stock lead wire is made in 99.95% chemically pure lead with trace
silver, packaged on spools of 25 lbs., and is not sold in smaller lots
since this would be a costly way to stock and sell wire. Many Corbin
clients do manufacture lead wire in smaller lots for other bullet
makers. The book "World Directory of Custom Bullet Makers" is full of
information by and about other bullet makers who can help you with
these purchases. If you wish to make lead wire or bullets for sale,
please request a form to allow us to list your business in the next
edition of this directory.
LB-4 Lead Billets, Pack of Four
This is a package of four chemically pure Bh 5 hardness 0.795-inch
diameter cylinders, four inches long. The package weighs 5,687.5
grains and the density of the lead is 0.4092 pounds per cubic inch.
You can use this as a test standard for other lead, or as raw material
to extrude excellent wire in the Hydro-press LED-1 extruder kit.
LB-5 Lead Billet, 1.5-inch Diameter
These billets are for melting down, primarily, although you can
use them to make 5 pound lengths of wire in an extruder. If you need a
source for good quality pure lead, and cannot find anyone near to you,
we stock a moderate quantity of these billets to help solve the
problem.
BMT-1 Billet Mould Tube, for LED-1
The LED-1 Lead Extruder Die kit comes with two mould tubes to make
your own 0.795-inch billets. If you need more, these tubes are honed,
blued, and ready to slip over the steel mould base that you fasten to
your workbench. Fill them full, pull them off the base, and give them
a shake to slide the billet out!
PCS-1 Precision Core Cutter
The Corbin precision core cutter uses a pair of hardened steel
dies which slide over each other to slice off pieces of lead wire to
proper length. You can adjust the length with a threaded stop screw
that is supported by a steel bar below the dies. The cutter comes with
a complete set of dies in standard wire sizes. The dies are held in
the two cutter bars by set screws and are easily changed.
Mount one bar of the cutter to your bench. The other has a nice
padded handle that you pull to cut the wire. Push the wire down
through the stationary top bar and die, with the handle in a straight
line so the dies are above each other. Adjust the stop screw so that
the lead wire will shear off at the length you wish (weigh a few pieces
to adjust the length for the right weight). The stop screw can be set
off to just catch the edge of the lead, so it doesn't drag across the
top of the screw. This gives you more accurate weights. The Corbin
Precision Core Cutter is made for soft lead to .365-inch diameter, and
will handle lead of Bhn 10 hardness up to .312-inch diameter. For
larger diameters, or for alloys up to Bhn 22 in any size, I recommend
the PCS-2 "Magnum" model, instead.
PCS-2 Corbin "Magnum" Core Cutter
This huge version of the PSC-1 is built with over-sized pivot,
extra large frame and handle, and accepts much larger diameter dies
than the PCS-1. We make this on special order -- it is not a stock
item -- and will make the dies at the same time, to fit any size of
wire you wish up to half an inch in diameter! Few people need this
tool, but for those who do, it is available from the die-works that
makes whatever you need to produce bullets.
PCS-D Core Cutter Die, Pair
Sometimes people lose a die or need a different size for some
reason. If you need a standard size, they are very inexpensive and are
in stock for each of the standard wire diameters (we use the .365-inch
wire die for the .340, since it works just fine). If you want a
special diameter, this can be made at standard shop rate rather than
the stock die price. Normally there is no need for any size other than
the standards. These dies are for the PCS-1 standard core cutter and
are kept in stock in standard sizes. I recommend that you use standard
sizes in the PCS-1, and order your custom diameters along with a PCS-2,
since the cost will be about the same either way for custom work.
CM-4 Corbin Four-Cavity Adjustable Weight Core Mould
Turning your own scrap lead into useful lead cores is easier than
casting bullets, and much faster. These moulds do not require handles.
One arm mounts to the bench. The mould projects from the bench, and
hangs over the edge. The other arm is a sprue cutter, but a long one
that doesn't need to be beaten to open it.
There are four pistons and cylinders in the mould, just like a
four-cylinder in-line car engine. The engine head would be like the
sprue cutter. Adjustable weights screw up and down on the bottoms of
four connecting rods that project from the cylinders. You can set all
four cavities to have exactly the same displacement by means of these
adjustment weights.
The over-all weight range is from zero to some large maximum for
each standard caliber. This is achieved by resting the four pistons on
a sliding captive bar, which we call a rest plate. The rest plate has
two over-sized holes that let it slide easily up and down on a pair of
threaded rods. The rods have a locking pairs of nuts on them, under
the holes in the rest plate.
You adjust the weight by setting the nuts on the rods, thus
changing the displacement or volume in all four cylinder at one time.
To eject the cores, you open the sprue cutter by pivoting it to one
side, and then press up on the rest plate. It easily moves up, pushing
all four pistons at once in front of it, and pushing the cores out the
top of the die!
Core moulds are made in all standard sizes from .224 to .458, in
the same step ranges as the lead wire. For sub-calibers, Corbin does
not make a core mould. It is not worth the trouble to cast these
cores, when you can easily extrude a life-time supply using a LED-2 kit
in your Mity Mite press! The LED-2 uses a regular .44/45 caliber
(.365") core mould for its billet supply.
CM-I Core Mould Insert (Piston & Cylinder Unit)
Each Corbin Core Mould has four piston and cylinder units, or
inserts, installed in a steel frame with set screws. You can change
these if you wish, to use one core mould for several calibers. I would
advise a person with a fairly active shooting schedule not to change
inserts, but to purchase a mould for each caliber.
First, you will find that it is faster and much more convenient to
have a complete, ready-to-use mould when you want to make cores. Time
is short enough for enjoying the shooting part and most of us don't
need to waste any of it if there is a faster way to get the bullets
made. Second, you will find that after changing the mould inserts a
few dozen times, they are hard to get in and out. This is because
every time you tighten the set screws, you raise a little burr which
eventually builds up the diameter of the insert so it won't fit the
frame.
The interchangability is fine for someone who only changes mould
inserts a few times a year. You can easily stone off the burrs that
result on the mould inserts. Eventually, if you change them often
enough, they get sloppy in the mould frame and have to be replaced.
The best plan is to use a separate mould for each caliber as originally
intended for this design, and to use replacement inserts only when
damage or dirty, gritty lead spoils the honed inside of the die insert
and makes the lead stick.
CM-2 Corbin "Magnum" Core Mould, Two-cavity Adjustable Weight
This adjustable weight two cavity mould is a huge version of the
CM-4, which has more cavities but is limited to diameters of .365-inch
and less. When you want a special, larger diameter, order one of these
moulds custom made to your requirements. Custom inserts are no less
costly for the CM-4, and you may as well have the larger equipment
since it will stand up longer when used with large diameters.
For diameters of half-inch and less, the CM-2 offers a rugged
steel frame with interchangable mould cylinders and pistons, made to
your order. These are not stocked, and there will probably be a
waiting list. Examples of possible need for this mould would be the
case of a person who wants to manufacture a lead .50 caliber Sharps
bullet and wants a mould to turn out .490-.495 inch cores.
.he CHAPTER 18 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
TOOLS FOR BULLET MAKERS
The basic tools of swaging are the press and dies. We have
already discussed the core mould, core cutter, and the supplies of
jackets and lead. Beyond this, most tools are to help you prepare
commercially-acceptable bullets for sale or to help you make bullets
more quickly, easily, or with a wider range of performance.
Some of these special tools involve controlled heating of the
components. For instance, you can make bonded core bullets using
Corbin Core Bond and either a Flameless Heat Gun (FHG-1) or one of the
electronic Heat Treatment Ovens (HT0-1 or HTO-2). Heating the jacket
materials to precisely controlled temperatures gives you the ability to
control the ductility and expansion in a way that most people,
including many otherwise experienced shooters (and writers) never dream
is possible.
A cannelure is not something that your bullets must have in order
to function properly, but it can add value to your commercial offerings
and perform useful functions in your own handloads. The cannelure
tends to stop expansion of the jacket within a limited range of
deceleration rates, and helps hold the core within the jacket on
impact. It gives you an area into which the case mouth can be crimped
if you wish to do this. And it identifies the bullet and points out
the correct seating depth if you wish to make it do so.
Bullets that have been polished to a high gloss have greater sales
appeal than mottled, dull bullets, even if there is no difference in
their actual performance. The BPK-1 Bullet Polisher Kit is a safe and
easy way to polish bullets, since it operates on the opposite principle
of a case tumbler. Case tumblers roll the components around against
the media and each other. They work fairly quickly, but they are also
rough on the exposed lead tips of your bullets. Vibratory polishers
work by rapidly shaking the polishing medium against the slowly moving
component. In other words, the medium does the moving instead of the
component (although the bullets do slowly move round in the boiling
mass of polishing material). This keeps the bullets themselves from
striking each other with such force that the tips are damaged.
HCT-1 Corbin Hand Cannelure Tool
No, it isn't for canneluring your hand: the HCT-1 uses a hand-
turned crankshaft to put professional cannelure grooves on your
bullets. A cannelure (that's CAN-A-LOOR) is a ring or groove around
the circumference of the bullet. Little serrations on the groove help
the cannelure wheel get a grip on the shiny bullet surface, and let you
put as deep a groove as you wish into it.
The HCT-1 tool received high marks from the American Rifleman
staff in a report in the "Dope Bag" of December, 1985. Since then,
we have found ways to make it even better, with knurled adjustment
knobs to set the bullet position and cannelure depth on any caliber
from .224 to .50 MG. The comfortable padded handle is wide enough for
your entire hand to press down, while powerful leverage puts tons of
force on the contact point of the bullet and roller. A roller V-block
supports the bullet as it turns.
Unlike vertical designs, the Corbin tool doesn't have to fight
gravity to hold the bullet in position. Also, it's a lot easier and
more comfortable to apply pressure by leaning slightly down on the
handle than it would be to try and press sideways. The leverage of the
Corbin tool is roughly three times more than the nearest competitive
model available today. But best of all, the HCT-1 works as it is
supposed to do, and then some. You'll find it handy for hard lead and
jacketed bullets, as well as straight pistol cases like the .45 ACP.
PCM-1 Corbin Power Cannelure Machine
This machine is a model of rugged simplicity. Housed in its own
steel case, with a powerful 115 volt drive motor and torque-multiplying
gear train, the PCM-1 takes bullets as fast as you can feed them to it,
and applies precisely located cannelures automatically. The bullets
ride on a rotating disk, through a machined steel guide plate, and out
the other side.
The cannelure wheel itself is unique to each caliber: you order
the tool complete with one wheel, and order additional wheels for each
caliber of bullet. This arrangement assures precise alignment and
exact control that cannot get out of adjustment during production runs
of millions of bullets. The position of the cannelure is set by steel
spacer disks that locate the wheel on a keyed shaft. Again, nothing
can get out of adjustment because the adjustment is a solid steel disk.
The machines are individualized for your order: they are standard
products, but the cannelure wheel is set for the caliber, and the
spacer disk is made for the proper cannelure height. Extra spacers are
provided so you can set make minor adjustments in position. While the
PCM-1 is obviously slower to set up for a job than the HCT-1, and
requires different cannelure wheels for various calibers, it does take
all the work out of big runs of cannelured bullets, and is very fast.
Order this tool by caliber and by the location, from the base, of
the bottom edge of the cannelure groove. Specify also the width of the
groove if you do not want the stock width (.050-inches wide, serrated,
very much like the conventional factory standard -- which it should be,
since many factory bullets are cannelured on a Corbin machine!). If
you want multiple grooves, be sure and send a drawing and sample
bullets if you have them already. Cannelure wheels are non-returnable
since they are made to your order -- a drawing will assure that you get
what you thought you ordered!
BPK-1 Bullet Polisher Kit
The Corbin Bullet Polisher Kit has been popular with handloaders
for well over a decade: long before any of the commercial vibratory
polishers were dreamed of, Corbin customers were happily making their
own for a fraction of the price!
This kit contains a thermally-protected vibrator motor, a steel
mounting bracket to hold it onto the bottom of any convenient
container (a 3-pound coffee can is most often used), a 1-pound bag of
walnut shell polishing medium, the self-locking nuts and bolts to
assemble the polisher, and instructions. The motor comes wired with
its own power cord and in-line switch, and runs on 115 volts AC.
(Sorry, no 220 volt models for export -- but Corbin DOES have a 220 to
115 volt converter unit available).
Simply punch four holes in the bottom of your container to accept
the four 1/4-inch mounting bolts, fasten the steel mounting bracket to
the container bottom (on the outside), slip the motor into the bracket,
and secure the clamping bolt that pulls the bracket tight around the
motor housing. Suspend the container by means of a coat hanger made
into a bail (punch two holes near the top, on opposite sides, and bend
the ends of the coat hanger wire through them). A door spring helps to
make the unit vibrate more efficiently and more quietly. The other end
of the door spring should be hooked over a shelf bracket or suspended
from a rafter by a cord.
This is the simple and quick way to do it. Many people have sent
us pictures of attractive stands with walnut bases and a single curved
steel rod made into the shape of a question mark, with the container
suspended under it. We don't make a base unit, since most handloaders
seem quite willing and able to make their own, and I'm not sure we'd do
as well as some of you have!
If you have a tumbler now, you may still want a vibratory polisher
for your finished bullets. The large tumblers are hard on bullets --
they bang the tips and scratch up the ogives. The vibratory action of
the BPK-1 is much more gentle. The particles of polishing medium are
set into rapid motion, instead of rolling the whole contents of the
container to get relative movement. The more massive bullets are not
banged into each other as they are with a tumbler.
WS-1 Walnut Shell Polishing Medium
Corbin packages walnut shells in the correct granulation for
bullet polishing, in one pound bags. Two of these bags is just about
all you want to put into a 3-pound coffee can. One is adequate. Extra
bags are economical and will work in your tumbler as well as the BPK-1
bullet polisher kit.
FHG-1 Flameless Heat Gun
A propane torch can be used to melt lead in a bullet jacket for
bonding the core (with Corbin Core Bond), or to anneal tubing or a
bullet jacket for improved performance or for reforming to different
calibers. But propane torches apply a very high temperature if you are
not careful. The flameless heat gun applies a lower, very even
temperature.
It takes longer to do the job with the heat gun, but you can do
many at one time by making a small enclosure out of boiler bricks and
aiming the heat gun air stream into the opening. A metal shelf made
from a cookie tray will hold the bullets. General purpose heating jobs
such as drying washed jackets and cores, applying a stress-relief heat
to gun springs and parts that you have made, and simlar 600-750 degree
F. jobs can be done without open flame, using the super-heated air from
the 115 volt FHG-1. The control switch has three positions: heat,
cool, and off. Operate the gun in the cool mode for a few minutes
before turning it off.
PE-1 Power Ejector Unit
We met this tool in the section on reloading press dies. It fits
over the top of any Corbin reloading press swage die, and most of the
jacket-drawing dies. Three set-screws fit into a groove machined
around the circumference of the die, just below the knurled top. The
PE-1 applies the multiple leverage of a minature compound lever press
to the top of your reloading press die, to eject the bullet with a
quick pull of a handle.
This operation replaces the mallet and ejector rod normally used.
A short piece of 1/4-inch diameter steel rod fits into the top of the
die instead of the normal knurled-head ejector rod. An adjustable
position ram with fine screw thread can be set to take up all the slack
in the system, so that you get full benefit of the compound leverage
(no wasted motion). The PE-1 uses a forked handle made with a
remarkable alloy, by the way: it is a high-tech version of the
aluminum-iron bronze which was once tried in the Winchester Model 1886
firing pin! The paramagnetic alloy took nearly 100 years of
development to reach a point where you could have a machined handle on
a modestly priced hand tool formed from it, but there it is: stronger
than iron, corrosion and rust proof, with over 110,000 psi tensile
strength and the combined characteristics of stainless steel and
bronze bearing material.
I mention this because if you have a reloading press and purchase
the PE-1, you might want to take a good look at the handle of the tool.
The entire frame and handle of the Mity Mite presses made in 1985-6
were machined from castings of this alloy, making the Mity Mite the
only swaging press in the world to have ever been constructed of
bronze, and also making it the most indestructable hand swaging press
ever made (until the advent of the Mega Mite).
HTO-1 Corbin Heat Treatment Oven, Model 1
Experimental labs and prototype shops all over the world use the
Corbin HTO-1 for precision heating of alloy steels, manufacturing
springs and gun parts, and of course for routine core bonding, jacket
annealing, and heat treatment of copper or brass tubing prior to
forming into jackets.
The HTO-1 is one of the most economical ovens in its size range.
Nearly any other furnace you will see advertised with the features, or
somewhat fewer, will be priced at two to three times as much! Corbin
purchases lab grade Thermolyne furnaces, strips out the cook-stove type
thermo-mechanical heat control, and completely rebuilds the furnace
with an electronic "brain" that applies a precise heating pulse, senses
heat rise, turns off the power, and senses heat loss. Then, it
compensates for the amount of heat loss by adjusting the next power
pulse width.
In this manner the HTO-1 is able to maintain heat control much
more precisely than any standard furnace. It is so accurate that you
can set it and forget it -- the temperature will go to the level you
set regardless of the oven load, and it will not go over it no matter
how long you leave the furnace on. A stainless steel 2000-degree
sensor probe replaces the original open junction thermocouple, and RF-
shielded input cable keeps the electronics from picking up motor noises
and other extraneous data.
The HTO-1 has a direct-reading knob setting. It is not calibrated
in relative units which have no relation to the actual temperature,
like the furnaces sold by others which look like the Corbin unit. The
furnace you would normally be able to purchase for about half the price
of the Corbin furnace has the original cook-stove type control. With
this very simple thermostat, there is no feedback from the furnace.
The control does not know what the temperature is in the furnace: it
only knows how long it has been feeding power to the furnace in
relation to how hot an internal bi-metal strip is getting, heated by
its own internal heating wire.
You could mount the thermostat in another room, and it would
operate just the same way. If you connected a lamp to the control, and
didn't even have a furnace wired to it, it would perform exactly the
same service of turning the lamp on and off at regular intervals. The
reading on the dial has no relationship to actual oven temperature. It
is merely the relative amount of time that power is applied to whatever
is connected to the control.
This means that you have to be right there, watching the pyrometer
reading, to know what is going to happen to the temperature. You
twiddle with the knob, setting it higher to try and get the temperature
to rise, and then watching to make sure it doesn't rise too high. If
you change the mass of material you put into the furnace, it will come
to a different temperature. As the oven is used and the radiation of
heat from it changes with time, the settings will mean different
temperatures even with the same load. In other words, it is a type of
control that gets you by, but only if you have plenty of time to watch
the meter and play with the knob.
The Corbin system is absolute. You set the temperature. The
electronics takes over and brings the oven to that temperature. The
pyrometer is still there, so you can read the temperature if you like.
But you don't need to be there if you have something better to do.
The cavity size of the HTO-1 is approximately 4 inches by 4 inches
square, with a five inch depth. The furnace runs on standard household
115 volt current, no special wiring required. (Export versions are
available at no extra cost, using 220 volts).
HTO-2 Corbin Heat Treatment Oven, Model 2
This is the commercial, heavy duty version designed for more
accurate setting and control, longer life, and slightly larger cavity
size. It has a built-in forced-air cooling system for the electronics,
a standard 1/4-DIN slip-out, interchangable controller box (and we
stock spares so if you should ever need a new controller, it is a fast
and easy job to slip in a new unit).
The HTO-2 also comes with a 50-degree plus or minus deviation
meter readout, in addition to the full scale 2000-degree F. pyrometer,
and an LED indicator tells when the controller is applying a heating
pulse to the furnace coils. The main power switch is also a 5-amp
circuit breaker, controlling power to the electronics and power
switching relay. The furnace can be ordered with Nitrogen atmosphere,
so that you can apply a small charge of inert Nitrogen gas to the
cavity and keep scale and oxidation at a minimum.
The cavity size is approximately 4.5 inches by 4.5 inches square
with a 6 inch depth. The larger oven cabinet allows for additional
ceramic fiber insulation (a space age material similar to the that used
on the Space Shuttle), and for generally heavier construction desirable
in a production unit. If you plan to manufacture bonded core bullets
in batches, this is the correct choice in a heat treatment furnace you
can depend on. (We use this same model every day, and have for a
decade, to make your dies!)
HTC-1 Heat Treatment Compound, 1-lb.
If you heat treat steel, this compound is going to make life a lot
easier for you! As you know, iron and steel parts oxidize and the
carbon "burns out" of the surface, leaving a softer alloy at the
surface, and often leaving pits or scale that destroys a finely
finished part.
A nitrogen atmosphere furnace is useful in reducing this oxidation
or decarburization, but at higher temperatures and with more sensitive
alloy steels, If you heat treat steel, this compound is going to make life a lot
easier for you! As you know, iron and steel parts oxidize and the
carbon "burns out" of the surface, leaving a softer alloy at the
surface, and often leaving pits or scale that destroys a finely
finished part.
A nitrogen atmosphere furnace is useful in reducing this oxidation
or decarburization, but at higher temperatures and with more sensitive
alloy steels,
temperatures, for as long as you could reasonable want to heat the
part. Then, when you quench the part or air-cool it, the compound
protects the surface from pitting and checking.
The glass is almost impossible to remove by grinding, wire
brushing, or handling. Only one thing works quickly, easily: boil the
part in hot water! The black protective coating dissolves, leaving
your part clean and heat-treated without any damage to the highly-
finished surface. This remarkable compound has been used to protect
Corbin swage dies, finished to 50 millionths of an inch with diamond
lapped interiors, for the past 15 years. We're willing to share this
important discovery with our friends in the gunsmith trade.
.he CHAPTER 19 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
CHEMICALS AND SUPPLIES
BOX-25 Bullet Packaging, 25 Boxes
Available in packages of 25, the Corbin commercial bullet
packaging system is one of the most cost-effective ways to sell and
ship your custom-made bullets. Each bullet is individually nested in
its own "chamber" surrounded by charcoal-color soft foam. There is a 5
by 5 matrix of chambers or cells in the 2-inch-thick foam block, which
results in either 25 large bullets or 50 small ones being safely held
in the foam.
There are years of research behind the packaging. Let me share
with you some of the reasons for this particular arrangement before
going into the other details of the box itself.
First, why 25 instead of 100 or 50 holes, or some other number?
Experience shows that handloaders will pay more per bullet without
complaint when the quantity purchased and priced is smaller than the
standard factory package of 50 or 100 bullets. Since there are half as
many or less in the package, your price for the package will seem lower
than it really is to the buyer who is comparing numbers in his head.
Second, good marketing practice in this field does not match the
number of bullets with the typical number of empty cases to be reloaded
at one sitting. Most rifle cartridges are packaged in lots of 20.
When a handloader reloads, he usually will reload all twenty cases.
With your custom bullets packaged in lots of 25, this gives him five
extra bullets.
The reason for the five is so that he will be more likely to take
one of them along with him to the range, to show his friends the
bullet he is test-firing. Also, he will have five bullets left over,
and few people want to throw away five bullets. They will probably
wind up on display somewhere, or be given to a friend, or, even more
likely, will remind him to purchase another package from you!
If you feel that there is space going to waste in the box with
smaller bullets, you can put two bullets in each chamber. There is a
foam cylinder in each hole, which will compress as much as needed in
order to hold any reasonable length of bullet on either side. Load one
side first, pressing the foam down with the bullet, then slip the box
over the foam block. Turn the box over, so the other side of the block
shows, and press 25 more bullets down against the foam cylinder (now a
disk compressed between the two bullets).
The package itself is square, and has triple fold end walls, to
make it highly crush-resistant. While plastic boxes look good on the
dealer shelves and on your reloading bench, they often are damaged in
handling and shipping when you try to send them without another package
around them for protection. And if you do that, your cost is more than
double what it would be with the single Corbin box.
The Corbin box is made for direct mail or UPS shipment without any
other protection. It is finished with eggshell white, and stores flat
until you need it. The interior dimensions are just right for the foam
block and foam pad which accompanies it (for tip protection). One of
the best features is that the box takes any size of bullets from .14 to
.600 Nitro! The special plastic foam material stretches without
tearing to hold the larger calibers snugly, and is soft enough so that
your small calibers will not be scratched up. Styrofoam (white semi-
rigid foam such as most ammo-makers use in the cartridge boxes) quickly
crumbles and becomes dirty from handling. The charcoal color sponge
foam looks good and stands up for your customer to use. The double-
wall corrugated box is actually tougher than either pasteboard or
plastic when it comes to handling.
If you wish to have a custom label made, your local printing firm
can make a self-adhesive label that is perfect for both shipping label,
box sealer, and advertising. Write for a free pattern and suggested
designs to assist your printer.
Remember, when you begin selling your product, the package is
extremely important. It can make or break your sales until your
reputation for a quality product is secure. If your package arrives
in good condition, has good eye appeal, and obvious thought has gone
into the way it is assembled and holds the bullets, then your customer
will be impressed with your concern for the product. You can spend a
lot more for plastic or reinforced pastboard without getting as much
benefit for the dollar, and wind up having to repackage all your boxes
in another shipping carton, adding to your expenses. The Corbin
packaging system does it all, and gets it there, at miminum cost and
with maximum protection.
CSL-2 Corbin Swage Lube, 2-0unce Bottle
CSL-16 Corbin Swage Lube, 16-Ounce (Pint) Bottle
All steps of swaging a bullet require a thin film of high-pressure
lubricant on the surface of the lead or jacket. Even if the
instructions don't mention it, proper lubrication is assumed any time
you put a piece of metal into a die. Core swaging, jacket drawing,
bullet reducing, and swaging all require Corbin Swage Lube for long die
life and proper operation.
The natural components of Corbin Swage Lube are clean, acid-free,
and good for the skin. Lanolin-based, but not lanolin alone, Corbin
Swage Lube has been used for over 20 years by the masters in the
swaging field. Synthetic lubes have come and gone, but this proven
formula remains the best choice.
Corbin Swage Lube is normally applied by putting a drop on your
fingertip and giving the component a twist between your finger and
thumb as you raise it to the die. This quick, natural movement saves
you time and does a good job. A thin film on the surface is all that
you need. A two-ounce bottle will normally service about 2,500
bullets. The pint size is a lifetime supply for most shooters.
Many handloaders have found that Corbin Swage Lube is far superior
to most of the case-sizing lubes on the market, and they use it
exclusively for resizing cases. The converse it not true: do not try
to use a standard case lube for swaging, as you will have stuck bullets
or worse. Case lubes simply are not designed to stand up to the high
pressures involved in swaging. They either break down or diesel
(ignite from high pressure within the die), neither of which does much
good and can result in a badly stuck bullet.
CDL-2 Corbin Dip Lube, 2-ounce Sampler
CDL-16 Corbin Dip Lube, 16-ounce (pint) Can
CDL-128 Corbin Dip Lube, 128-ounce (gallon) Can
Dip Lube, also called "Liquid Jacket", is a special wax lubricant
in a solvent carrier. If you manufacture lead bullets, you can dip the
lead cores into Dip Lube prior to swaging, then swage them while damp.
The lube works well enough for lead in the swage die, and then drys
quickly to form a tight skin or jacket of wax on the bullet surface.
No grooves or cannelures are needed to hold this film, which is hard
and non-sticky, yet flexible enough for rough handling.
The lube works by the process of molecular attraction, using
polarized wax molecules to attract to the metallic surface of the lead
bullet. The special wax is designed both for this feature and for
resistance to high temperatures. You can also use it for cast bullets,
if (heaven forbid!) you should still want to cast bullets once you have
read this manual! It takes the work out of the process. Instead of
having to size and lubricate each bullet, you can put them in a
strainer or wire basket and dip them all at once in a can of Dip Lube.
No particular time is required for the wax to attract to the
bullet. Once it touches the lead, a film of wax molecules has already
bonded to the surface. If you want to let the wax cure and then dip
again, you can repeat the process. But successive layers are held by a
different mechanism than the first one. Repeated dipping may help with
guns and loads that tend to foul the bore with lead bullets, as will
rolling the damp, freshly dipped bullets in graphite or a product
called "Motor Mica". Most users, including some large commercial
bullet makers who buy it by the gallon, find that Dip Lube works quite
well just as it comes.
Other uses for this quality wax compound include a stock wax that
is tougher than most, a boot water-proofing that gets in all the seams,
a protective film for gun metal exposed to the rain, and a great way to
keep screws and nuts from rusting when used outdoors. Wood screws
dipped in Dip Lube go in easier and are not attacked by the acids and
moisture in the wood. I have even soaked cardboard rolls in Dip Lube
and used it as a very safe-to-carry fire starter for my campfire
(the supposedly dry undersides of standing deadwood even get soaked in
our Oregon rains!).
CCB-2 Corbin Core Bond, 2-ounce Sampler
CCB-16 Corbin Core Bond, 16-ounce (Pint) Bottle
CCB-128 Corbin Core Bond, 128-ounce (Gallon) Bottle
Most people only need this product to make good hunting bullets.
If your interest is target shooting, there isn't much point in using
it. Core Bond makes it possible to form an alloy junction by diffusion
of metal, between the lead core and the jacket. Core Bond forms a
junction stronger than solder, and more easily.
The reason you might want to try it is that bullets made this way
will outperform the same bullet made with a partition by 50% or more,
judging by retained weight and expansion. Partition designs typically
lose most of the front core when they expand. We like them because
they manage to protect the rear half of the core. But a bonded core
bullet typically holds 90 to 100 percent of the original weight with
just as great, or greater, expansion!
In test after test, including more than 150 Cape Buffalo to date,
and both domestic cattle and a wide variety of game, the bonded core
bullet will outperform nearly any other kind of construction. And best
of all, you can use the bonded core IN ADDITION to other designs.
Several Corbin clients have established high quality businesses making
partitioned, bonded-core bullets for people who feel they want both
features, or for people who want the partition and think it does the
job while actually the bonded core is what is making these bullets so
good.
To use Core Bond, swage your cores as usual. Then, swab the
inside of a group of jackets with Core Bond. Use a liberal amount.
Some people use a cotton swab large enough to squeeze into the jacket
and thus wipe the entire inside in one pass. Put the cores into the
jackets. They should fit closely but not so tightly that they have to
be pressed in. Use an eyedropper to put one more drop of Core Bond
down the gap between the core and jacket wall.
If you have a small quantity to make, you can use a propane torch
to heat the jackets, thus melting the lead inside and letting it form
an alloy with the jacket wall. If you have many to make, the Corbin
HTO-2 furnace (or the smaller HTO-1 for less frequent production) is
the best way to apply controlled heat. Raise the temperature enough to
melt the lead. Then let the jacket cool. Do NOT quench in water!
Cautions: First, do NOT lean over or look into the jackets while
you heat them. If the core fits too tightly, the gas pressure in the
base will pop the core out of the jacket and splatter you with molten
lead! If your core does fit somewhat snugly in the jacket bottom, and
you experience a problem with the cores popping out, then you may need
to get a smaller core swage, or at least rig up a screen to put over
the top of your jackets to keep the core inside during heating.
Second, be careful with Core Bond. It contains a strong acid,
among other things, which can cause blindness or painful burns to the
skin. Wash up spills immediately, and neutralize with baking soda. Do
not use Core Bond in aluminum or steel containers, as it attacks them
quickly.
Batch processing of bonded cores usually involves making a
rack out of stainless steel mesh. Water systems often use a wide-
spaced woven stainless wire grid to keep foreign matter out of the
intake. If you can find some of this material, it is ideal for folding
into a rack to hold jackets upright, simply by placing them in the grid
holes. Other methods involve making a rack (like a test tube rack)
with aluminum blocks drilled with holes to support the jackets. Make
the rack so it fits into the cavity of the HT0-2 oven without touching
the sides. About half an inch of space should be left between oven
walls and the first jacket.
You can stack two such racks in the oven at one time, with most
jackets. About 100 jackets can be bonded at one time this way. But
even if you do them one at a time, using a propane torch, the bonding
process is fairly quick and well worth the effort. When you have
finished and the jackets are cool, lubricate them well and seat the
core in the normal manner. If there is a surplus of black oxide at the
top of the core, you may wish to tumble the bonded cores and jackets or
vibrator polish them before going on. Make certain that you do NOT use
any abrasive in your walnut shells, if you plan to seat the cores
after polishing. Abrasive particles will embed in the jackets, and
will quickly lap the dies at random, just as they are lapped on purpose
with brass and diamond.
CCB-2 Corbin Bore Cleaner, 2-ounce Sampler
CCB-16 Corbin Bore Cleaner, 16-ounce (Pint) Can
CCB-128 Corbin Bore Cleaner, 128-ounce (Gallon) Can
Some of the top shooters in the world have stated that they
"couldn't have won without it". That's very kind of them, but I think
they'd win no matter what they used. Still, this cleaner is very
effective and much different from the others that have so loudly
appeared and enjoyed a brief spotlight of publicity, then vanished.
For the past twenty years, Corbin Bore Cleaner has been quietly at
work in the commercial gunshops, in the gun rooms of top competitors,
and in military and law enforcement armories, removing rust, leading,
powder fouling, plastic from shotgun bores, and copper traces from
jacket fouling. We haven't raised a big fuss about it: it is just one
more of those products waiting for the curious handloader to discover
on his own. When you do, you'll wonder why anyone is impressed by all
the advertising that floods the magazines and impresses the writers
concerning cleaners that promise to get "all the fouling out".
Just try this some day: clean your gun with anything else. When
you think it is clean, dip a cloth patch in Corbin Bore Cleaner and run
it down the bore. Look at the patch. You'll see why Corbin Bore
Cleaner is one of the quiet secrets of many master shooters around the
world. Now, if you like, you can really clean your barrel with a
couple more patches. And then follow it up with one of the other fine
products that doesn't shout at you from every magazine article and
page, then fade into the night: Hoppe's Number Nine! No, I had
nothing to do with developing this and I don't sell it. But it works
very well as a follow-up to protect your bore and to remove the last
traces of Corbin Bore Cleaner, which holds the last traces of fouling
in its grip.
Between Corbin Bore Cleaner, Hoppe's Number Nine, Corbin Cleaning
Solvent, and Corbin Gun Oil, you need nothing else to take expert care
of your firearms. These four products will remove gunk and accumulated
grease, clean out the bores and protect them, and apply a thin film of
protective oil to lubricate and preserve the metal.
CBL-2 Corbin Bore Lap, 2-ounce Bottle
If you have a badly rusted or pitted bore, severe fouling, or a
newly-cut barrel to be lapped, this abrasive compound is formulated to
remove as little steel as possible while taking off burrs and high
points, and anything that projects above the steel surface, such as
fouling. The 40-micron particle size is fine enough not to scratch or
damage your bore, yet the disc-shaped particles align under pressure so
that they tend to act in one direction, along the axis of the bore,
rather than cutting in all directions like conventional grinding
compounds.
This is a product for people who know how to lap bores, not for
casual use on a new barrel. But if you have an old barrel and want to
try to save it, clean it up, and get it shooting reasonably well again,
a good polishing with Corbin Bore Lap is worth a try. (Try to remove
fouling with Corbin Bore Cleaner first. If that doesn't do it, try
anything else you care to spend money on to assure yourself that Corbin
Bore Cleaner really is the most powerful safe cleaner available. Then,
when you are convinced that only lapping the bore can save it, use CBL-
2. If that doesn't do it, have it rebored!)
FSO-16 Corbin Gun Oil, 16-ounce (Pint) Can
There must be a good dozen gun oils on the market. The reason we
offer another one is because it is probably the same thing you are
already purchasing in small lore to spend money on to assure yourself that Corbin
Bore Cleaner really is the most powerful safe cleaner available. Then,
when you are convinced that only lapping the bore can save it, use CBL-
2. If that doesn't do it, have it rebored!)
FSO-16 Corbin Gun Oil, 16-ounce (Pint) Can
There must be a good dozen gun oils on the market. The reason we
offer another one is because it is probably the same thing you are
already purchasing in small lo from Corbin, in pint cans that give you more
gun oil (which is really high grade ISO-15 instrument and lathe spindle
oil) for the money. You can wind up paying three times as much per
ounce in the little cans. So, save your last little can and refill it
yourself with Corbin Gun Oil in the bulk (pint) container!
We recommend using this oil on moving parts of Corbin presses, to
protect Corbin dies that are not going to be used for a while, and for
your fine firearms. We use it for our lathes and mills, and general
purpose lubrication, as well as packaging the dies with a few drops of
the preservative oil inserted into the poly packs.
CCS-16 Corbin Cleaning Solvent, 16-ounce (Pint) Can
This is a good general purpose clean-up solvent for removing
fingerprints, grease, and oils from metal. It is flammable, but not as
volatile as gasoline or alcohol. It can be used to remove Corbin Bore
Cleaner from the bore after it has done its job of removing the
fouling, if you would rather use it than Hoppe's. This solvent
actually pulls oils from the surface of whatever it contacts, so it
will draw the natural oils from your skin as quickly as it removes oil
from metal. I recommend using dishwasher gloves when degreasing any
significant number of gun parts, and avoiding any unnecessary contact
with the skin.
CCS-16 is also good for cleaning jackets and cores prior to
swaging, to remove any traces of lubrication inside the jacket or on
the core. (First you lubricate the core, then swage it, then remove
the lube completely so there will be nothing between the core and
jacket to prevent a close, non-slipping bond.)
CHF-128 Corbin Hydraulic Fluid, 128-ounce (Gallon) Can
Specially formulated for the Corbin Hydro-press, this hydraulic
fluid stands up to hard use and is safe with the seal materials used in
the valves and cylinder of the CHP-1 series presses. If you should
lose oil from moving the press or doing any work on its hydraulic
circuits, a gallon of CHF-128 is the right quantity for most minor
service replacements. The red gallon container makes a nice spare
gasoline can, too!
SL-4 Silver Lube, 4-ounce Can
Silver Lube is a high temperature, high pressure lubricant that
can stand up to 2000 degrees F. It is used for extreme drawing jobs
such as heavy copper, brass, or steel tubing jacket manufacture, for
certain kinds of swaging where regular swage lube is not suitable, and
has applications where heat and pressure are extreme. It prevents
rusting and corrosion when used on lead moulds, such as on the pivot
points and sprue plates, adjustments and mounting screws. It is also
rather messy and turns everything silver, including your hands! When
you need it, nothing else does the job. Most of the time, if you can
use CSL-2 Corbin Swage Lube, it's a lot neater and easier to clean up.
Special note for makers of bonded core bullets: If you form a
bullet jacket using Silver Lube, as recommended with most of the heavy
copper tubing jacket-makers, you must clean off every trace of the lube
before trying to bond the core. Silver Lube protects the surface
against the action of Core Bond and prevents alloy formation with the
lead core. Strong solvents such as MEK or Tri-Chlor are needed to
remove the lube film. Remember, it takes heat to 2000 degrees F., so
there is no way to melt it off.
WS-1 Walnut Shell Polishing Medium
Corbin packages walnut shells in the correct granulation for
bullet polishing, in one pound bags. Two of these bags is just about
all you want to put into a 3-pound coffee can. One is adequate. Extra
bags are economical and will work in your tumbler as well as the BPK-1
bullet polisher kit.
.he CHAPTER 20 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
TAKING CARE OF YOUR DIES
A good quality bullet swage die should last a lifetime in normal
operation. With the right lubricant and normal pressures, wear is
virtually non-existent. Here are some tips for avoiding damage:
(1) Use only CLEAN components. Never use dusty, corroded, or
dirty lead or jackets in the dies. Keep a clean work area. Wipe the
inside of the dies with a clean cotton swab prior to use. Never put a
die away with a component inside it, especially one that has been used
with Core Bond. If you tumble or vibrator polish your components prior
to swaging, make absolutely sure that no abrasive compounds have been
added to the polishing medium. Abrasive additives will embed in the
jacket and core material, and will act just like laps to wear the
surface of the die when you swage the bullet.
(2) If you should stick a bullet in a die, never try to drill,
dig, scrape, or pry out the bullet. Certainly never heat the die to
melt out the stuck bullet, as this will ruin the precise temper of the
metal. Instead, use the methods outlined in the book, "Rediscover
Swaging". No tools are required, and the methods work 100% of the
time. A detailed description is also given in the "World Directory of
Custom Bullet Makers", on removal of stubborn stuck bullets.
(3) Do not attempt to "improve" the dies or punches unless you
are willing to accept responsibility for the warranty yourself. If a
punch or die does not seem to be the right size, send it back with a
note and samples of your components. If you decide to go after it with
a file, you've probably spoiled it for anyone else to use, so sending
it back then doesn't help anyone. By now, any basic design problems
have been solved a thousand times over, and any problems would either
be misuse, a defective part or the wrong part sent by error, or
mismatch of components to the dies. These can all be solved by a phone
call or, at most, an exchange or replacement.
(4) Use the right lubricant. Most problems with stuck bullets or
hard operation can be traced to lubricant (or lack of it).
(5) Never force any component into a swage die, if the component
is larger than the bore of the die. This is a major bad thing to do.
You can destroy the die, the punches, or both. If a part won't go into
a swage die by hand, then do not force it under pressure. Swaging
always increases the diameter, never reduces it. To "swage down" is a
contradiction. You can "draw down" with an open-end ring die.
(6) Use jackets and core lengths recommended for a given set of
dies. If you want to experiment, bear in mind that you will quite
likely reach some limits for any given shape and size of die. Each set
has a wide range of latitude in bullet weight, but you cannot always
make both the weight and the style you want in the jacket you select.
Sometimes, you have to trade off one parameter against another to make
the system work with the available supplies. Part of the practical
side of bullet making is recognizing that some of the arbitrary
specifictions can be moved one way or the other without really
affecting the bullet performance. If you are practical about your
bullet design, you will have no trouble coming up with designs that are
easy to make in existing equipment.
(7) Swaging pressures are high because of the small area of the
typical punch, through which all the force of the ram is channelled.
It is NOT necessary to use all your might to operate the press. If any
operation seems to be taking more than a comfortable, one-hand
pressure, then it is likely something is wrong and you should find out
what it is. I have seen .243 caliber punches shoved into a .224 die,
drawing down the solid tool steel of the punch and wrecking it. But
the operator kept on making bullets with his newly-formed .224 punch,
only returning it when he finally realized that the operation took more
force than it should. I have gotten back point forming dies with a
piece of solid brass or copper pushed into them, which started out
being 7/16-inch diameter (.4375"). The die bore was .429-inch
diameter. You can't do that. Use a draw die first, to bring the
material down to less the bore size.
(8) There may be some initial confusion over the punches and
dies. It looks like confusion could reign supreme whenever you
accidently mix up a set of dies with another one. But actually, the
components will serve as quick gauges to sort everything fast. All you
have to do is slip a punch into the die to see if it fits. To discover
which caliber of die you have, just slip a jacket into it. If it fits
easily but closely into the core seater, then you have the right die.
Core swages have punches that fit closely into the die on both
ends. Core seaters have an internal punch that fits the die bore and
an external punch that fits either the die bore (semi-wadcutter styles)
or the jacket inside diameter. A micrometer is handy for checking out
the dies. If you have a set of 9mm and a set of .38 dies, for
instance, there is only about 0.003-inches difference, at most, between
their bores. You cannot see that small a difference. So, make a lead
core using whatever external punch fits easily into the die. Measure
the lead core. That's your caliber.
(9) If you should ever find yourself getting frustrated over a
seemingly difficult problem in swaging, don't keep fighting the
problem: give me a call. With thousands of people around the world
now making their own bullets, and with a history of better than two
decades of operation of the equipment, it is unlikely that you have
equipment that won't work or that the process is too difficult for you.
The odds are that (1) I didn't write the instructions clearly
enough and a little discussion on the phone or in a letter would make
some point clear to you that solves everything, or... (2) Someone in
the shipping department picked up the wrong die or punch when they were
testing and packaging, and you got it, or... (3) You are trying to do
something that seems reasonable to you, but which a little more
experience with the principles of swaging would quickly show to be
impractical or impossible.
In any case, remember that help is a phone call away. Most
problems resolve themselves with great ease when the die-maker gets in
on the case. Sometimes a die or samples may have to be exchanged, and
in difficult cases where you are trying to make something with
components other than those we used to design the set, it may take two
or three exchanges to solve the problem. But rest assured, you are not
alone to solve everything yourself. I have had a taste of that in the
computer industry, where you can spend tens of thousands of dollars and
get a shrug when nothing seems to work right, the warranties all expire
before you even figure out that the system isn't working right, and you
wind up with no choice but paying more for something you should have
gotten in the first place. Corbin is noted for outstanding support,
and that is the way it should be.
.he CHAPTER 21 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
DELIVERY AND PAYMENT INFORMATION
Corbin dies are hand-made, often to custom order. We are the only
die-works in the world willing to offer so many calibers and styles of
equipment. In fact, the development of the entire field of bullet
swaging in the past twenty years has primarily been due to the heavy
investment of time and effort we have made in bringing bullet swaging
back from the brink of oblivion to a commonly-used process for
handloaders. Part of that effort has been to bring the cost of the
dies within reach, while maintaining the custom features and quality.
And part of the cost of the dies has often been the fact that we
are absolutely buried in orders, making it necessary to have a waiting
list for delivery on many items. I often state "If you can't wait,
don't order!", because it is easier not to know that I lost an order
from someone impatient than to try and explain over and over how much
work I have backed up and how long it takes to get to any given job.
Since 1985, most of the orders have been shipped within two days
of receipt. The new plant, which is the world's largest bullet-swage
die works, is stocked with most of the common calibers most of the
time. We do get behind even on common calibers, but not the two and
three years we used to quote. Today, you have a good chance of
delivery on standard items within two days, a slight chance that we may
be out and will be making more within 30 to 45 days, and a very slim
chance that what you ordered is odd enough that it will take us several
months to schedule in the making of reamers, laps, and tooling to
produce your dies.
Still, I would rather that you are prepared to wait than that you
expect immediate delivery and are disappointed. So, I cannot guarentee
delivery on any specified date, or within any specified period of time.
Making as many custom dies as we do, and with the limited number of
skilled die-makers to do it, I cannot guess how long the next five,
fifty or five hundred orders will actually take from start to testing
and completion. Each one presents its own problems, its own special
differences in tooling and technique to be developed and tested.
The end result, though, is that each set of dies will produce the
bullet it is designed to make. We can develop a whole new product for
you to sell or use, one that did not exist before, and you do not have
to bear the expense of the lost time developing it. Once we have
worked it out, solving problems you will never have to know existed,
you get a set of tooling that is subtly modified to perform your
particular job correctly. If you took your bullet idea to just about
any other die-works in the world and had them make tools to produce it,
you would most likely be paying time and material charges for every
hour spent chasing down the problems and trying different ideas.
We are working as fast as we can, and there is nothing more we can
do. Offers to "buy a lot more later" or threats to "go somewhere else"
are both beside the point and have no effect. As I say, if you decide
you want the equipment and support that goes with it, both of which
have a hard-earned reputation that reaches back a couple of decades,
then you should make up your mind before ordering it whether or not you
have the patience to wait for delivery.
I have simply cancelled orders and handed back deposits to people
who become unpleasant to deal with. Life is too short and I enjoy my
other customers far too much to waste time with blustering fools who
don't appreciate the effort that would go into their dies, and don't
realize how closely a die-maker needs to work with his clients both
before and after the dies are done. One is not motivated quite by the
same things in this business as, for example, in selling a conventional
kind of mass produced tool. I don't mind spending hours with a
beginner explaining how something works, if necessary, but I have no
time for demanding individuals who think that money substitutes for
manners.
We do publish a periodic list of items that are available for
immediate delivery, called our "Immediate Delivery List". Ask for a
copy when you write or call. The items on this list are on the shelf
and can be sent to you straight away. Quite often, we have new things
that are not yet on the list, and if you have some particular caliber
in mind you might mention it when you write or call. We can let you
know, then, whether or not the item is available for delivery. It is
harder to let you know when it will be available...many factors affect
the delivery of dies, including the possibility that a nearly completed
run may have to be thrown away because of tiny flaws that show up in
final testing. If this should happen, our original estimate may be off
by months.
It is always best to place an order as soon as you are sure you
want it and are willing to wait for it. The sooner your order is
placed, the sooner we will have enough backlog on a particular item to
schedule it. We run non-stock or special items based on when the order
came in, you see. If your order for a .416 Rigby bullet swage came in
four months ago, and someone else wanted a .577 Snyder set six months
before, we'd schedule the earliest positive order first. I say
positive order because the mention on the phone that you might be
interested in something is not an order. If we have a deposit on it,
and your written order in hand, then it is an order and we will place
it in the computer scheduling system. It will be done as soon as it
can be done. Otherwise, it probably will be lost in the constant flood
of phone calls that continues morning to night.
A good way to assure prompt delivery on a phone order is to give
alternatives where such alternatives are acceptable to you. In other
words, if you don't really care whether your .366 rifle bullet has a 4-
S or a 6-S ogive, then let us know either is acceptable. The first one
finished goes to you. It might be that we finished a fine set of 4-S
ogive dies a day after your order came in, but since you specified a 6-
S ogive, we never even considered sending that set. And it may well be
months before we can get time to make the 6-S reamers and laps.
Likewise, if the diameter can be 0.429 or .430, either way, and
still be acceptable to you for your battery of .44 Magnums (practically
speaking, it doesn't usually make much difference and there is probably
that much or more variation in the bores anyway), then let us know. We
may have a dozen sets of .429 dies just like you want, but if your
order specifies .430, then we will wait until we can make the .430 size
to fill it. If a cup base or a flat base is equally acceptable, let us
know that. We will give you exactly what you specify unless you give
us a range of acceptable differences that might speed up delivery.
It doesn't necessarily slow up delivery to specify exactly what
you want with no alternatives. It is just that many times we have
something close on hand. If it really does not matter to you, then we
could ship the available package and you'd be making bullets within a
few days. On the other hand, if you really do want a specific style or
size, we are glad to provide it. Just be patient until the die-makers
work their way through the mountain of orders and can get your work
done.
I hope that this makes sense to you, and doesn't offend anyone
except people neither you nor I would like to deal with in the first
place! The alternative to being swamped with orders is to raise prices
so few people could afford to buy. Then, those who could would let us
work a lot less for the same income. That was the situation before we
came into the swaging field, many years ago, and that is how most die
makers operate today. But motives other than simply making money
brought us to this field and inspired us to develop it. I'm no more
altruistic than the next fellow, but I do feel somewhat responsible for
the survival of the bullet swaging art. You are the carriers of that
torch: all I can do is make sure the equipment continues to be
available at a reasonable price, and that new ideas continue to be
explored and written about.
TERMS OF PAYMENT
Corbin accepts VISA and MASTER-CHARGE orders by letter or
telephone. If an article will not be availble for some time, we
normally submit a bank card payment request only for those items we can
ship quickly. The rest of the articles will not usually be "put on
your card" until they are ready to ship, unless you specify otherwise.
Corbin accepts postal money orders, bank money orders drawn on
U.S. banks in U.S. dollar amounts, certified checks, International
Money Orders, and other instruments of immediate negotiability drawn on
U.S. banks for U.S. dollar amounts. Checks from other countries, drawn
on correspondent U.S. banks, must be sent for collection. This process
usually involves a delay, and the local banks charge a healthy fee for
this service. Sometimes this doesn't leave enough actual payment to pay
for the equipment.
Thus, we ask our friends in other countries to use one of these
methods of payment:
(1) International Money Order
(2) Postal Money Order for U.S. Dollars
(3) VISA or Master-Charge
(4) Direct funds transfer to our current account number. Please
write for the address and number. At the time of this writing, it is
Jefferson State Bank, Medford, Oregon 97501, USA, but problems can
develop if you send funds to an account we have closed or to a bank
from which we have switched our account. If you plan to transfer
funds, please write first and get instructions. When you do make a
transfer, insist that your bank send notification to us and have our
bank notify us as well when they receive the funds. This is simply
good business and makes sure funds are not misplaced or stolen.
Domestic orders paid with personal or business checks do require
at least two weeks for check clearance. We will hold any items on the
Immediate Delivery List, upon first receipt of your funds, so that
check clearance will not cause the last item to be sold while you are
still waiting.
Remember that UPS delivery usually takes about 10 days, and that
the UPS will not even begin a trace on a package until at least 15
working days have passed. Foreign shipment usually involves both
fairly long transit time by surface (or fairly high air mail cost) and
a delay in getting through foreign customs offices. We send a notice
when packages are shipped, to let you know they are in transit, in
these cases.
We do accept COD orders, but if you are not there when the package
comes, it may come back to us. If a package sent COD comes back, we
send you a card to let you know, wait about 15 days for some response,
and if we hear nothing, cancel the order and any pending orders that
are COD, and sell the equipment. If a COD package is refused, we do
the same thing. When packages are refused, or otherwise undeliverable,
it costs us to ship and receive the same package back. For this
reason, we do not accept additional COD orders when we have had any
significant number of problems with sending them before.
COD orders may be paid to the UPS delivery man by certified check,
money order, or in cash. If someone signs for a COD order and pays for
it, then UPS has a record of where and to whom they delivered it, and
if for any reason you did not receive it, let us know. We can have UPS
trace the delivery, and find out who got it.
When a COD shipment is sent, a postcard is also mailed telling you
the amount and date of shipment. I can't guarentee that the postcard
will get there before the package does, because that is up to the US
Mail. But it usually does. In some rare cases, a person might have
sent funds for something, and then received it COD. If you want it
quickly, the best solution is to go ahead and accept the COD, notify us
immediately of the error, and let us credit your account or send a
refund check. Otherwise, it may be weeks before the package finally is
routed back to us and we are able to get it re-shipped again.
Usually, this latter kind of error only happens when a person
orders by telephone, follows up by letter, and repeats the order, or
uses both COD and prepayment at different times on parts of the same
order. The most trouble-free method is to send payment with the order,
or to use a bank card. Bank cards give you a good tax record and
simplify the entire payment operation, and are only a little more
paperwork for us, so don't feel reluctant to use them on our account!
.he CHAPTER 22 CORBIN HANDBOOK AND CATALOG NO. 7, PAGE #
WARRANTY INFORMATION
If any Corbin product proves defective in materials or
worksmanship, call 503-826-5211 and request authorization to return the
product. If, upon inspection by Corbin, the product does prove
defective, it will be repaired or replaced without charge other than
transportation.
The warranty in this section is in lieu of all other warranties,
including any implied warranties of merchantability or fitness for a
particular purpose.
Firearms safety requires that individual handloaders and shooters
ascertain at their own discretion and risk the proper loads, bullets,
and cartridges to use in their firearms. Corbin has no control over
the circumstances of loading, and can assume no liability for the
results obtained. We can guarantee only that our products are capable
of producing bullets which meet our own high standards of quality.
The accuracy of firearms is dependent upon a number of factors,
most of which are beyond the control of the manufacturer of the bullet
or the tooling which produces the bullet. Individual firearms require
careful load development to achieve satisfactory accuracy. A bullet
which performs well in one firearm may not perform as well in another,
very similar firearm, for a variety of reasons, some of which are not
well understood.
The responsibility for accuracy rests with the handloader and
shooter. Corbin has no control over the circumstances of either
loading or shooting, and can therefore assume no responsibility for the
results obtained by any particular shooter, handloader, or firearm.
Delivery of Corbin products cannot be guaranteed at any
particular time nor within any specified period. Purchasers of
equipment must bear full responsibility for the results of their
advertising and promotion, contracts or agreements between themselves
and other parties, which could be affected by the delivery of Corbin
equipment. Corbin advises that NO committments be entered which depend
upon timely delivery of equipment from Corbin for their successful
completion. Potential commercial operations based on swaging bullets
made on Corbin equipment should wait until delivery has been received
before offering products for sale, entering contracts for delivery of
bullets, or making other agreements involving the use of such
equipment.