Crimp for 9mm-How much?

Tom Gardner

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Dec 21, 1997, 3:00:00 AM12/21/97

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Reloading with my new Dillon Square Deal B, and changed my crimp setting
while playing with setup. Is there a reliable way of determining the
proper adjustment?

Tom

Rod Regier

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Dec 22, 1997, 3:00:00 AM12/22/97

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In article <67kmac$e...@xring.cs.umd.edu>,
Tom Gardner <Tom.G...@worldnet.att.net> writes:
# Reloading with my new Dillon Square Deal B, and changed my crimp setting
# while playing with setup. Is there a reliable way of determining the
# proper adjustment?

I haven't worked with the Dillon dies, but I found that using
a factory 9mmx19 cartridge was helpful in setting up my
(taper) crimping die in 9mmx19.

Shotgun150

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Dec 22, 1997, 3:00:00 AM12/22/97

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i crimp mine until it maakes a .005 mark in the jacketed bullet,has always
worked for me.

Steve Tuttle

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Dec 22, 1997, 3:00:00 AM12/22/97

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Tom Gardner <Tom.G...@worldnet.att.net> wrote:

:Reloading with my new Dillon Square Deal B, and changed my crimp setting
:while playing with setup. Is there a reliable way of determining the
:proper adjustment?
:
:Tom

Use a taper crimp. Only crimp the round enough to keep the bullet from
moving with moderate pressure. Sever crimps are a very bad idea for
9mm cartridges.

Peter Nolan

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Dec 22, 1997, 3:00:00 AM12/22/97

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On 21 Dec 1997 22:20:44 -0500, Tom Gardner
<Tom.G...@worldnet.att.net> wrote:

(:>Reloading with my new Dillon Square Deal B, and changed my crimp setting
(:>while playing with setup. Is there a reliable way of determining the
(:>proper adjustment?
(:>

Yup, measure the diameter with a vernier caliper. try and get just at
the edge of the rim, it should be 0.003 to 0.005 smaller than the case
just behind it.

The 9mm is a tapered case, after seating a bullet, do *not* crimp, but
measure it right at the neck of the case. Then adjust the crimp tool
to give the desired 0.003 to 0.005 crimp. The harder you crimp the
more pressure that has to build up to move the bullet. This can affect
accuracy and other stuff.

Peter

Now for the Price WAR!
http://aluminator.tierranet.com
(Excuse typo's as I hack at 60+wpm and don't re-read)
(Spelling errors are better than NO reply at all <G>)

GeorgePSW

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Dec 22, 1997, 3:00:00 AM12/22/97

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What you want is really not a true crimp. The crimping die should remove the
"bell" made by the powder die... and return the case wall back to straight.
It is permissible to give the crimping die one TINY little bit extra inward
crimp... but that must be TINY.

Do you have a reloading data book? Some give the target measurements for the
case rim after the crimp.

In article <67kmac$e...@xring.cs.umd.edu>, Tom.G...@worldnet.att.net
says...
#
#Reloading with my new Dillon Square Deal B, and changed my crimp setting
#while playing with setup. Is there a reliable way of determining the
#proper adjustment?
#
#Tom
#

Rocky Clayton

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Dec 22, 1997, 3:00:00 AM12/22/97

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Tom Gardner <Tom.G...@worldnet.att.net> wrote in article
<67kmac$e...@xring.cs.umd.edu>...
# Reloading with my new Dillon Square Deal B, and changed my crimp setting
# while playing with setup. Is there a reliable way of determining the

# proper adjustment?
#
# Tom

Try running a factory round up into the die and
screwing it down until it stops. Lock everything
down and make a round. See if it looks OK.
This works for me.

Rocky

PS: This method does not work when determining
seating depth of bullets, since you may be using
bullets with a different weight and profile than the factory
round.

Dries Venter

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Dec 29, 1997, 3:00:00 AM12/29/97

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I always thought you don't put a crimp in a 9mm, as it headspaces on the
front of the case? Or is the .003-.005 recommended here not enough to
stuff the case past the shoulderagainst which it should headspace?

Dries Venter
Pretoria
South Africa

Peter Nolan <pno...@goodnet.com> wrote in article
<67moea$k...@xring.cs.umd.edu>...
# On 21 Dec 1997 22:20:44 -0500, Tom Gardner
# <Tom.G...@worldnet.att.net> wrote:
<snip>
# The 9mm is a tapered case, after seating a bullet, do *not* crimp, but
# measure it right at the neck of the case. Then adjust the crimp tool
# to give the desired 0.003 to 0.005 crimp. The harder you crimp the
# more pressure that has to build up to move the bullet. This can affect
# accuracy and other stuff.
#
#
# Peter

Rod Regier

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Dec 30, 1997, 3:00:00 AM12/30/97

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In article <689h77$s...@xring.cs.umd.edu>,
"Dries Venter" <ven...@ilink.nis.za> writes:
# I always thought you don't put a crimp in a 9mm, as it headspaces on the
# front of the case? Or is the .003-.005 recommended here not enough to
# stuff the case past the shoulderagainst which it should headspace?

Light taper crimp, *not* roll crimp.

Yes indeed, most non-bottleneck auto-pistol cartridges *do* headspace
on the case mouth.