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From: n9020351@unicorn.cc.wwu.edu (James D. Del Vecchio)
Newsgroups: rec.guns
Subject: Reloading questions: 40 S&W and 45 ACP
Message-ID: <35456@mimsy.umd.edu>
Date: 11 Jun 91 13:47:34 GMT
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I have this issue and last of Handgun Quarterly/ Shooting Times.

A few items:

Per mag maximum chamber pressure is about 35,700 cup for 38 super, 40 S&W,
and 10mm Auto, vs about 19,900 max for 45 ACP.

Why is this and what significance of it?  Are the 45 cases weaker for some
reason, or is it the construction of the pistols?  Is it possible to make
a 45 withstand the higher pressures?  Thicker cases maybe?

I've been told the 38 super and 10mm are both louder than the 45, is this
entirely due to the higher muzzle pressure?

Is the .40 also louder than the .45, say with the subsonic loads?

According to their charts you can get more velocity using the same powder
charges and bullet weights in a 4" 40 S&W than you can with a 5" 45.
Why would this gun be more efficient?

Jim Del Vecchio