Don't roll crimp 9mm, .40, 10mm or .45 ACP or any rimless semi auto because rather than headspacing on the rim of the cartridge like most revolvers, a semi auto cartridge headspaces on the mouth of the case which catches on the slim rim in the front of the chamber. If you roll crimp these, there is a chance than the cartridge will drop deeper into the chamber and cause misfires because the cartridge is away from the firing pin. It may not be too good for your chamber either.

A taper crimp will allow a semi auto cartridge to drop into the chamber and headspace properly on the front of the chamber.

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