Chris:
I reload 45 auto using both commercial and military brass, one hell of a mixture, matter of fact. In any event, using TAPER CRIMP, I set the die (trial and error) so that the case o.d., at the case mouth of a reload is .470" dia. This dimension seems to work fine is 2 different pistols.
Insufficient taper crimp can cause feed failures(jams), to much crimp can reduce bullet diameter, leading to poor accuracy, might also crumple cases.
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