Shouldn't be no crimp on a 45 ACP. The case is a cylinder.
Some people say crimp when they mean remove the bell during bullet seating. This should be done but mouth should be the same diameter as body of case.
EDIT: if you actually roll crimp or taper crimp a 45 ACP you will likely have an excess headspace condition. The firing pin will drive the ctg deeper into the chamber rather than solidly hitting the primer. HTH George
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