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From: snitor!petert@uunet.UU.NET (Peter Toth)
Newsgroups: rec.guns
Subject: Re: To trim or not to trim auto pistol brass
Message-ID: <35680@mimsy.umd.edu>
Date: 15 Jun 91 02:56:17 GMT
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In article <35600@mimsy.umd.edu> boyd@mailer.cc.fsu.edu (Mickey Boyd) writes:
#[...]
#By the way, this brings up an interesting point.  If the 9mm/.45ACP is 
#supposed to headspace on the case mouth, and if the vast majority of the 
#brass made in these calibers is too short to make this possible, what is the
#primary force that  holds the case against the slide face?  I personally
#believe it is the extractor (since lots of other really smart folks do :-).
#However, this may also imply that by using "correctly" sized and lengthed
#brass you may get more consistency (ie accuracy, never mind where you would
#get this brass).  Anybody tried this?

Not me, but it sounds good.

Match barrels have shorter ("tighter") chambers, so that the case
does headspace on the forward end.  This is one of the reasons for the
decrease in their reliability.  (Tight frame-to-slide is another, etc).
"Field" barrels are expected to have crud in them, so there is room left for it.

You could lengthen brass by firing it with an high pressure load from a chamber
that can take it.  For example there are inserts available for the 30-30,
30-06, 308 that'll fit a 30 carbine or 32ACP case.  I know of no sleeves in
the .35 caliber (38/357/380/9) but i'd love to hear about one.
If the 444 Marlin is rated higher than the 44Sp and 44Mag, it could be used
for them.

Peter Toth