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How to Swage Bullets Using The

RBTO-4-M, -S, or -H Die Set

Type -H dies fit into the ram of the Corbin Mega-Mite press (CSP-2), Corbin

Hydro, Jr., (CSP-2H) press, and the Corbin Hydro-Press (CHP-1). The type -

M dies fit either the horizontal Silver Press (CSP-3) or the vertical Series II

Press (CSP-1). The type -S dies fit only the Series II Press (CSP-1). The last

letter, -M, -S, or -H, describes the outside diameter, threads, punch lengths,

and which presses the die set will fit. If a tool fits both the -S and the -M

systems and there would be no difference in it for either of them (such as

punch holders or draw dies), then the -M designation is used.

The 4-die set consists of a CORE SWAGE (CSW-1), a BOAT-TAIL PREFORM

(BT-1), a REBATED BOATTAIL FINISHER (BT-2), and a POINT FORM (PF-1)

die, each with one internal and one external punch, except the two rebated

boattail dies share the same external core seating punch.

An EXTERNAL PUNCH is held in the FLOATING PUNCH HOLDER (FPH-1-

M or FPH-1-H), which comes with the press and screws down into the top

plate of the press. For the -M and -S external punches under 3/8-inch caliber,

a threaded bushing and steel ring are removed from the bottom of the punch

holder, placed over the external punch, and then screwed back into the bot-

tom of the punch holder to secure the punch. The punch holder screws into

the press head, so the punch faces the ram. For -M and -S punches from 3/8-

inch up, the bushing and ring are part of the punch assembly. For -H external

punches, only a threaded bushing is used, without the steel ring. The external

punch is the TOP punch in these systems.

The die screws into the press ram, with its INTERNAL PUNCH inside the

ram. Some internal punches require the use of spring powered retraction: for

the PF-1-H die, the internal punch is called an EJECTION PIN punch, and it

will have a quarter inch diameter hole through the head portion, through which

a 1/4-inch diameter retraction pin fits. The pin goes below the large spring

around the press ram, and pushes down on the pin, which then pushes the

punch down when the ram is raised, making it easier to insert material into

the die. For the PF-1-M and PF-1-S dies, a notch is machined into the head of

the internal punch, which matches a removable pin with knurled head pushed

into the front (CSP-1) or top (CSP-3) of the press. This is the STOP PIN. It

presses on the tail all punches except for the ejection pin punch, to cause

ejection on the down stroke. Because the PF-1 die would form the bullet around

this pin if the pin were allowed to remain in the die cavity during swaging, the

stop pin must be put into the notch and used to keep the pin retracted from

the cavity during swaging, holding it firmly during the down stroke to cause

ejection of the bullet.

In the -H system, a knock-out or ejection bar goes through a slot in the press

ram, below the spring and also below the retraction pin (if one is required—

not all punches have a hole through the head). The knock-out bar supports

the head of the internal punch while the component is being swaged, and

comes to rest on the press mounting plate on the downward stroke. This stops

the movement of the bar while the ram continues down, making the punch

stop moving while the die goes down with the ram.

The RBT deflects

muzzle gas so it

does not focus in

front of the bullet,

as with the

standard boattail.

Stop Pin

(CSP-1 or

CSP-3 press)

fits the slot in

the ejection

pin punch

head.

External

Punch

Internal

Punch

Internal

ejection

punch,

PF-1

Point

Form

Die

External

RBT PF

Punch, is

used ONLY

to push

the RBT

bullet into

the PF die.

Any other

use may

destroy it.

CSW-1 Core Swage: adjust lead core

weight and shape.

BT-1 Boattail Preformer: seats the

lead core into the jacket and forms

the start of the boattail section.

Same external punch is used in the

next die...

BT-2 Rebated Boattail Finisher: seats

the lead core again and forms the

rebate shoulder on the boattail.

Internal punch is a loose fit, only

used to eject the bullet.

PF-1

Point Former: forms the ogive

curve on the bullet. Use

the RBT external punch.

External

Punches are

held in the

press HEAD

using the

Floating Punch

Holder.

Summary of content (2 pages)

PAGE 1
How to Swage Bullets Using The External Punch RBTO-4-M, -S, or -H Die Set Type -H dies fit into the ram of the Corbin Mega-Mite press (CSP-2), Corbin Hydro, Jr., (CSP-2H) press, and the Corbin Hydro-Press (CHP-1). The type M dies fit either the horizontal Silver Press (CSP-3) or the vertical Series II Press (CSP-1). The type -S dies fit only the Series II Press (CSP-1). The last letter, -M, -S, or -H, describes the outside diameter, threads, punch lengths, and which presses the die set will fit.
PAGE 2
Never try to swage a component that will not go into the die by hand. The swaging operation depends on each component being slightly smaller than the die bore, and increases the bullet diameter a little with every step. The core seating die and point forming die are matched to each other for a given jacket and core material to within 0.0005 to .0010 inches with the core seater being smaller. The first die is the CORE SWAGE (CSW-1). It is used to form a piece of lead to precise diameter, length and weight.