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Ok, I see what you mean now. My mistake. Sometimes I can type faster than I can think.

...if you apply a crimp and press the cartridge mouth into the bullet the cartridge won't headspace properly.

When you said "crimp" I believe you intended to say "roll crimp". Roll crimp is definately something you don't want on a 45ACP or 9mm cartridge.

In the "for what it's worth" dept.: Too little crimp and the cartridge will sieze up in the chamber preventing the slide of your pistol from returning to battery. A Failure To Fire (FTF) will result. It's got to be "just right" to function properly.

Gerry