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What happens with different case lengths when cartridges headspace on case mouth?
A cartridge that is too long won't allow the bolt to fully close and go into battery. Too short is likely to have a light primer strike and not go off.
I have 9mm plinking brass that is all over the place for length but I very rarely have a problem with light primer strikes and the cartridge not going off. I would bet the extractor keep the cartridge from going too deep into the chamber to the point where it wont light off.