corbin pt-50 User Guide

INSTRUCTIONS:

The PT-50-H fits the ram and press head of Corbins CSP-2 Mega­Mite press, CSP-2H Hydraulic Mega-Mite, and CHP-1 Hydro-Press.
It is used by running the ram to its top limit,
and then adjusting the shell holder body
(during use) and the anvil screw and lock
nut (pre-adjustment, prior to use) to obtain
the desired primer depth. A hex wrench is
provided to adjust the protrusion of the anvil screw, from the base
end. This pre-setting is done first, and final setting is done by turn­ing the shell holder body. The ram can be very slightly lowered, rather
than running it all the way down for each operation, to insert a new
primer and case. The end of the press stroke is used as a positive
stop, to prevent variations in seating depth due to slight changes in
the press stopping point.

CAUTION: These powerful presses can easily crush and detonate
the primer under certain circumstances. Never put any part of your
face or body over the top of the case. Do not attempt to prime loaded
cases! Serious injury or death can result from fragments of primer
or case materials expelled in the event of a detonation. Practice
seating empty, fired primers before attempting it with live primers,
to make certain of the adjustment.

Use the lowest pressure that will seat the primer consistently. Keep
the tool lightly lubricated with a rust-preventive lubricant when not
in use. Remove any lubricant from the inside of the shell holder and
the priming hole (where the primer will rest before seating) prior to
use. If a shell does not accept the primer with relative ease, the
pocket may be crimped or need to be reformed.

PT-50-H

Priming Tool for the 50 BMG

Use the precision of your Corbin Swage
Press to seat primers in the .50 BMG and
similar cases.

Anvil Screw:
Pre-adjustment for
primer depth.

Anvil Base:
screws into 1X12
TPI press ram.

Anvil Lock Nut:
secures anvil screw.

Shell holder body: screws into

1.5X12 TPI press head.

Seating Punch:
presses against
anvil screw to
seat primer.

The PT-50-H fits the ram and head of these Corbin Swag­ing Presses: CSP-2 Mega-Mite, CSP-2H Hydraulic Mega­Mite, and CHP-1 Hydro-press.

Shell
holder

PO Box 2659, White City, OR 97503 USA

Phone [phone] Fax [phone] E-Mail [e-mail]

Web Site http://www.corbins.com

Disassembly of
the shell holder

body.

SH-50

PT-50

50 BMG Shell Holder

The Corbin SH-50 (50 caliber Browning Machine Gun car­tridge shell holder) is machined entirely from chrome-moly
steel, and is hardened and tempered for extreme tough­ness and long life. It is not merely case-hardened or hard
plated, but is hardened completely through and then drawn
to proper temper for toughness in electronically controlled
heat treatment ovens.

A recess for protruding primers is machined across the face,
and the holder has a hole large enough for priming and
depriming operations. The extra strong side walls resist
breakage when pulling crimped bullets.

The shell holder has a 7/8-14 standard thread, which screws
directly into a Corbin reloading adapter for the CSP-2
MegaMite press, the CSP-2H Hydro Junior, or the CHP-1
Hydro-Press. It also screws into the Corbin PT-1 priming
tool, a press-mounted device to insert primers into the car­tridge precisely. Corbin can make custom adapters to use
the shell holder in other types of presses or tools. Write for
a quote.

50 BMG Priming Tool

The Corbin PT-50 (50BMG priming tool) comes with a SH­50 shell holder, and works in any of the larger Corbin presses,
such as the CSP-2, CSP-2H, and CHP-1 HydroPress.

The priming tool screws directly into the ram of the press,
using the standard 1-inch X 12 tpi thread (same as -H swage
dies). An adjustable length punch fits through the body of
the priming tool, and can be set so it provides exactly the
desired amount of seating depth.

The shell holder screws into the top of the priming tool body.
The body provides two functions at once: (1) It serves as a
priming tool, and (2) it positions the shell holder so the case
can be deprimed on the upward stroke.

To use the tool as a shell holder for depriming, install the
resizing/depriming die in the press head. Insert a .50 BMG
case into the shell holder and raise the ram. The priming
punch will drop below a port in the side of the priming tool
body, allowing the spent primer to drop through the shell
holder, into the body, and out the angled port hole in its side.
Lower the ram and remove the deprimed case, and repeat.

To prime the cases, clean the pockets, remove any crimps
with a crimp removal tool. Raise the ram slightly, and the
priming punch will drop enough to insert a primer in the shell
holder. Insert a cartridge case, and lower the ram all the
way to seat the primer. Raise the ram slightly and remove
the case, then repeat.