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Old February 1, 2011, 11:42 PM   #5
Hog Buster
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Join Date: October 26, 2009
Location: Pointe Coupee, Louisana
Posts: 763
The thing to read here is “taper crimp” as opposed to roll crimp. 9mm’s head space on the case mouth, rolled crimps cause problems on 9mm’s. A taper crimp is just swaging the case to the bullet. The amount of swage is determined by measuring the diameter of the case at the very case mouth with bullet installed. A taper crimp die is used for this operation and a dial caliper is used to measure the results. The amount of taper crimp varies with who or where you get your information.
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