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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Potential downsides to fast twist barrel?
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<blockquote data-quote="AZShooter" data-source="post: 1840931" data-attributes="member: 5219"><p>I can tell you based on experience that with a 1 in 7 twist 3 groove barrel was too much for 180 VLD Bergers both hunting and target versions. My friend made a 7 STW and I made a 7 Rem mag. We used 30" Lilja 3 groove 1 in 7 twist barrel as that was all he offered at the time that would stabilize the 180 Bergers. I see now that there is a 1 in 8 which is also a 3 groove.</p><p></p><p>Friend's rifle began to damage the 180 hunting VLDs around round count 100 and mine did the same at approximately round count 200. The result was bullets that diverged many inches from the point of aim at 100 yds.</p><p></p><p>Dan quit on this project and rebarreled to another configuration. I switched to the thicker 180 target VLDs. After another 75 rounds or so the barrel began to damage the bullets. I then tried moly which helped for a while then quit working.</p><p></p><p>Switched to an 140 accubond and also a Barnes TTSX and issue didn't show again.</p><p></p><p>Our conclusion on why those bullets failed is a combination of faster than required twist and being a 3 groove barrel. Why the delay in damage? We think the throat became rough and the amount of shots fired with the STW with its greater powder charge caused it to go first. Perhaps the 30" barrel was also a factor as it can create more friction heat transferred to the barrel. See this article written by Berger:</p><p></p><p>[URL unfurl="true"]https://www.longrangehunting.com/threads/bullet-failure-article.20778/[/URL]</p><p></p><p></p><p>FYI RPMs for the two rifles:</p><p>7 STW 318, 857</p><p>7 Rem mag 303,428</p><p></p><p>If you shoot monos you will avoid this issue of bullet failure should you get a faster twist barrel. I remember decades ago Steve Shelp and a friend both made 6.5-300 Weatherbys for hunting. It was a wildcat back then. Steve remarked that he had a faster twist barrel than his friend's and he swore the faster twist rifle killed more dramatically.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1840931, member: 5219"] I can tell you based on experience that with a 1 in 7 twist 3 groove barrel was too much for 180 VLD Bergers both hunting and target versions. My friend made a 7 STW and I made a 7 Rem mag. We used 30" Lilja 3 groove 1 in 7 twist barrel as that was all he offered at the time that would stabilize the 180 Bergers. I see now that there is a 1 in 8 which is also a 3 groove. Friend's rifle began to damage the 180 hunting VLDs around round count 100 and mine did the same at approximately round count 200. The result was bullets that diverged many inches from the point of aim at 100 yds. Dan quit on this project and rebarreled to another configuration. I switched to the thicker 180 target VLDs. After another 75 rounds or so the barrel began to damage the bullets. I then tried moly which helped for a while then quit working. Switched to an 140 accubond and also a Barnes TTSX and issue didn't show again. Our conclusion on why those bullets failed is a combination of faster than required twist and being a 3 groove barrel. Why the delay in damage? We think the throat became rough and the amount of shots fired with the STW with its greater powder charge caused it to go first. Perhaps the 30" barrel was also a factor as it can create more friction heat transferred to the barrel. See this article written by Berger: [URL unfurl="true"]https://www.longrangehunting.com/threads/bullet-failure-article.20778/[/URL] FYI RPMs for the two rifles: 7 STW 318, 857 7 Rem mag 303,428 If you shoot monos you will avoid this issue of bullet failure should you get a faster twist barrel. I remember decades ago Steve Shelp and a friend both made 6.5-300 Weatherbys for hunting. It was a wildcat back then. Steve remarked that he had a faster twist barrel than his friend's and he swore the faster twist rifle killed more dramatically. [/QUOTE]
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Potential downsides to fast twist barrel?
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