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Old February 1, 2006, 06:38 AM   #26
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Join Date: May 15, 2002
Location: Michigan
Posts: 1,427
You'd normally taper crimp when you headspace a round on the case mouth.
You'd roll crimp a cannelure or when the bullet headspaces on the neck or the rim.
357SIG really headspaces on both. And most rounds available for it don't have the cannelure, so I kinda question why it would be roll crimped as well.
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