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Old January 31, 2001, 03:30 AM   #1
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Join Date: January 25, 2001
Posts: 254
I figure this would be the best place to ask.

Is there a set standard for brass expansion? How do you know if your chambers are oversized and your brass is expanding too much? With factory ammo, I've found that my .40S&W (Walther P99) expand (bulge) out on average .012" at the widest. My .45ACP (Sig P220) expand out on average .008".

Is this normal? How much is too much?

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Old January 31, 2001, 07:06 PM   #2
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My Ruger p944 brass expanded about .005", My Beretta 96's are about .006-.007". I have seen S&W Sigmas from the local PD that expanded .012-.014", and a Glock 23 that went up about .017". Hope that helps some.
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