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Long Range Hunting & Shooting
Any gains to a gain twist?
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<blockquote data-quote="Dragoon300" data-source="post: 2555723" data-attributes="member: 115285"><p>I had Bartlien do two gain twist barrels for me.</p><p>As was stated above they suggested no more than 1" gain. However, they do make .224 barrels with more gain for service rifle match shooting. </p><p>And there are many match shooters that use gain twist barrels, most under 1" gain. This is done to continuously improve the seal of the projectile to the rifling.</p><p>The 20mm x 103 Vulcan cannons are a serious gain twist, they start out straight and progress to a cork screw at the muzzle. This was done to get the heavy projectile rotating without stripping the rotating band off.</p><p></p><p>I decided that gain twist makes sense for my application, I wanted to get heavy bullets started with less pressure, I also had them done with 5R profile rifling which has also been said reduce friction and pressure. Along with these I had them do lefthand twist to help mitigate coriolis effect in the Northern hemisphere. </p><p>So my 6.5 PRC has a 31" 5R Lefthand 1:8.5 to 1:7.5 gain twist barrel that gives me 3311 fps average velocity with 156 grain Bergers and shoots 1/4 moa.</p><p>My 338 LM is also a 31" 5R Lefthand with 1:10.35 to 1:9.35 gain twist. I am still in load development with this, but it shoots well and is getting good velocity. </p><p>I firmly believe gain twist and 5R rifling helps get heavier bullets rotating easier, I have gotten great velocities without dangerous pressure signs running max loads. Certainly some of this is my 31" barrel length, but I seat the bullets .010 off the lands so it's not due to a lot of free bore.</p><p>Then the continuously improved sealing all the way to the muzzle, and lefthand twist can't hurt so why not use it? I have not seen anything wrong with my gain twist barrels, they shoot very accurately. I'm very happy!</p></blockquote><p></p>
[QUOTE="Dragoon300, post: 2555723, member: 115285"] I had Bartlien do two gain twist barrels for me. As was stated above they suggested no more than 1" gain. However, they do make .224 barrels with more gain for service rifle match shooting. And there are many match shooters that use gain twist barrels, most under 1" gain. This is done to continuously improve the seal of the projectile to the rifling. The 20mm x 103 Vulcan cannons are a serious gain twist, they start out straight and progress to a cork screw at the muzzle. This was done to get the heavy projectile rotating without stripping the rotating band off. I decided that gain twist makes sense for my application, I wanted to get heavy bullets started with less pressure, I also had them done with 5R profile rifling which has also been said reduce friction and pressure. Along with these I had them do lefthand twist to help mitigate coriolis effect in the Northern hemisphere. So my 6.5 PRC has a 31" 5R Lefthand 1:8.5 to 1:7.5 gain twist barrel that gives me 3311 fps average velocity with 156 grain Bergers and shoots 1/4 moa. My 338 LM is also a 31" 5R Lefthand with 1:10.35 to 1:9.35 gain twist. I am still in load development with this, but it shoots well and is getting good velocity. I firmly believe gain twist and 5R rifling helps get heavier bullets rotating easier, I have gotten great velocities without dangerous pressure signs running max loads. Certainly some of this is my 31" barrel length, but I seat the bullets .010 off the lands so it’s not due to a lot of free bore. Then the continuously improved sealing all the way to the muzzle, and lefthand twist can't hurt so why not use it? I have not seen anything wrong with my gain twist barrels, they shoot very accurately. I'm very happy! [/QUOTE]
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Any gains to a gain twist?
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