The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Thread Tools Search this Thread
Old August 17, 2013, 03:39 PM   #26
Senior Member
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,043
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?
dahermit is offline  
Old August 17, 2013, 04:39 PM   #27
Bart B.
Senior Member
Join Date: February 15, 2009
Posts: 6,318
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.

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.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master

Last edited by Bart B.; August 18, 2013 at 10:55 AM.
Bart B. is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 11:44 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2017 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.05398 seconds with 7 queries