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Old August 17, 2013, 03:39 PM   #26
dahermit
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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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Old August 17, 2013, 04:39 PM   #27
Bart B.
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dahermit, Sierra's rep said the reason was due to a lot of requests for cannelured 22 caliber HPMK's for use by folks in their AR15 type semiauto rifles who wanted to crimp bullets in their reloads. The bullet's cannelured so crimping can be done more easily. So, to me, it was another way for them to sell stuff keeping customers happy and make money. I believe Sierra's folks making and testing bullets know very well that any crimp on rifle bullets degrades their inheirant accuracy by adding another variable to the ammo that'll never be zero in magnitude.

https://www.sierrabullets.com/store/...red-box-of-500

I think it's like a master gunsmith asked to build a match rifle that'll compete with the best of them but the customer insists it use a Shaw or McGowen or Green River barrel.
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Last edited by Bart B.; August 18, 2013 at 10:55 AM.
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