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As many millions of pistols have been made in .45 acp from high end competition guns to bargain basement Zamak slide versions, the expected chamber dimensions will vary quite a bit. I taper crimp my .45 acp rounds just enough to return the mouth to parallel and screw in the crimp die about another 1/4 turn. I do not worry much about exact dimensions of the crimped surface. I just want to eliminate the belled end and hold the bullet firmly. The .45 is very forgiving of ammo unless you are shooting an ultra tight STI comp gun.
 
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