After firing a 2-1/2" shell that is pie crimped is the same length as a 2-1/2" shell that is roll crimped. You should be able to get more stuff in the roll crimped cartridge but with modern dense powders excess room is usually the problem.

I am a member of 16 gauge reloaders group. As I remember what I read there a roll crimp adds about 1000 psi over a pie crimp.

Best,

Mike


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