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Old August 17, 2013, 02:31 PM   #25
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 8,927
Finally got Sierra Bullets' replys to my queries on their new, cannelured .224 caliber 77 gr. HPMK bullet. Their man says Sierra finally figured out how to do that.



Those HPMK's are roll cannelured with tiny, oblong dimples, not in the bottom of a groove that's commonly done, so bullets are not significantly deformed. These shoot just as accurate as their non-cannelured ones. But only when they're not crimped in the case neck by any means. Crimping them, even the slightest amount, degrades accuracy as tested at 200 yards in their rail guns. They've known this for decades.

I see no objectives in testing crimp issues when folks with better equipment eliminating all the human variables thay I have have proved by any doubt that when best accuracy is the objective for centerfire rifles, no crimped in bullets will be used.

Last edited by Bart B.; August 17, 2013 at 02:49 PM.
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