Crimp - The star-shaped folded closure at the mouth of a shotgun shell. 


Crimp - Roll crimp (largely supplanted by the star-type crimp; top photo.


The nominal length of a cartridge is measured with the crimp open---for which the gun's chamber must be long enough to accommodate.


Newly-crimped (empty) 10-bore rifle cartridge case.                                                      Crimping die.                   Set tool which forms crimp when placed atop crimping tool and struck with hammer.


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