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Old October 15, 2012, 02:43 PM   #2
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Join Date: February 13, 2006
Location: Washington state
Posts: 13,001
SAAMI says 45 Colt cartridge rim thickness is .060" +.000" -.011", so .056" is OK, and .45 Colt chamber dimensions say thickness for the rim is .060"-.074", so .063" is OK. I wouldn't worry about it either way.
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