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Building Your Next Custom Rifle
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<blockquote data-quote="Litehiker" data-source="post: 1563521" data-attributes="member: 54178"><p>glbhunter,</p><p>For a 6.5 CM I want to shoot bullet weights from 140 gr. on up. That means to me a 1:7.5 twist so I'm not over spinning the 140s but still OK for 150s or higher.</p><p></p><p>So far, with 147 gr. Hornady ELD-M rounds the 1:8 twist for 6.5 CM in both my former Ruger American Predator and my current Browning X-Bolt Pro has not shown anything but nice round holes at 200 yards and sub MOA 200 yard groups. That tells me the bullets were stabilized to 200 yards.</p><p></p><p>The Ruger had a cold hammer forged 5R barrel and the Browning has a standard 6 land/groove cur rifled barrel (factory lapped) and both shoot 140 gr. ELD-M rounds in 1/2" groups. Gotta remember the Browning X-Bolt Pro cost about 4x as much as the Ruger so that accuracy is saying a lot for Ruger's cold hammer forged barrels and innovative actions. (FULL DISCLOSURE- I did have a Timney trigger in the RAP.)</p><p></p><p>Beyond 200 yards I don't know for sure but one would think a tiny, unnoticeable instability at 200 yards may become big at 800 yards. Yet shooting steel out to 960 yards on a silhouette course shows very good accuracy with 147 gr. ELD-M rounds from two different 1:8 twist 22" barrels. That makes me think 1:7.5 twist is going to be a good compromise for a wide range of 6.5 mm bullet weights.</p><p></p><p>So yes, I like Bartlein barrels. I can get any twist I want, 5 R rifling if I want it, stainless steel, absolute minimum SAAMI spec size chamber, factory barrel lapping, threaded muzzle, etc. And I'll take every one of the above. I'll get the wife a new fur coat this year to placate her and ease my conscience. </p><p></p><p>Eric B.</p></blockquote><p></p>
[QUOTE="Litehiker, post: 1563521, member: 54178"] glbhunter, For a 6.5 CM I want to shoot bullet weights from 140 gr. on up. That means to me a 1:7.5 twist so I'm not over spinning the 140s but still OK for 150s or higher. So far, with 147 gr. Hornady ELD-M rounds the 1:8 twist for 6.5 CM in both my former Ruger American Predator and my current Browning X-Bolt Pro has not shown anything but nice round holes at 200 yards and sub MOA 200 yard groups. That tells me the bullets were stabilized to 200 yards. The Ruger had a cold hammer forged 5R barrel and the Browning has a standard 6 land/groove cur rifled barrel (factory lapped) and both shoot 140 gr. ELD-M rounds in 1/2" groups. Gotta remember the Browning X-Bolt Pro cost about 4x as much as the Ruger so that accuracy is saying a lot for Ruger's cold hammer forged barrels and innovative actions. (FULL DISCLOSURE- I did have a Timney trigger in the RAP.) Beyond 200 yards I don't know for sure but one would think a tiny, unnoticeable instability at 200 yards may become big at 800 yards. Yet shooting steel out to 960 yards on a silhouette course shows very good accuracy with 147 gr. ELD-M rounds from two different 1:8 twist 22" barrels. That makes me think 1:7.5 twist is going to be a good compromise for a wide range of 6.5 mm bullet weights. So yes, I like Bartlein barrels. I can get any twist I want, 5 R rifling if I want it, stainless steel, absolute minimum SAAMI spec size chamber, factory barrel lapping, threaded muzzle, etc. And I'll take every one of the above. I'll get the wife a new fur coat this year to placate her and ease my conscience. Eric B. [/QUOTE]
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