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Old May 28, 2000, 10:53 PM   #2
Bud Helms
Join Date: December 31, 1999
Location: Middle Georgia
Posts: 13,155

A properly adjusted taper crimp doesn't crimp the case mouth far enough down to cause that problem. It will bring the mouth of the case back down after belling and makes the mouth perfectly round. Most importantly, it doesn't roll the case mouth into a soft lead bullet or a cannelure. The mouth stays straight (as in an extension of the case wall) and doesn't roll it over and cause bulges. It's the best way to avoid chambering problems caused by crimping.

I experimented once with adjustment on my taper crimp die on .45 ACP rounds with lead bullets and never could get the case mouth down past .469. A lot of variables there, though.
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