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Old August 17, 2013, 03:39 PM   #26
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Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 4,013
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.
Why do they put a cannelure in a bullet if it is not intended for crimping? For looks? Did they tell you why?
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