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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bartlein gain twist barrel
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<blockquote data-quote="J E Custom" data-source="post: 1087206" data-attributes="member: 2736"><p>I did some research on gain twist rifling to find out the reason for it in the first place.</p><p></p><p>As I understand it, The problem with standard rifling is that with High speed projectiles is there tendency to shear the engraving in the bullets because of inertia at firing. old worn out barrels are notorious about this because the lands are worn down and have rounded edges that allow the bullet to jump the rifling to some degree.</p><p></p><p>When the rifling is very fast it has the same tendency and will slip the bullet jacket if it starts to fast.</p><p>the bonded bullets and the mono material bullets have solved the jacket slipping problem and minimized the need for gain twist rifling in many peoples minds.</p><p></p><p>The Germans started messing with it to hopefully solve the accuracy problems on there really big</p><p>guns that had to start a 4000 pound+ projectile rotating. They finally determined the solution was to cut many lands and grooves to give the engraving as much surface area as possible to solved the problem.</p><p></p><p>The new technology in large heavy projectiles is to use fins to rotate the projectile and use a smooth bore.</p><p></p><p>It is one of those things that make a lot of sense, but from a practical stand point has not been proven to be better. As someone said ; when someone wins a big bench rest match with a gain twist barrel then it may prove to be better. </p><p></p><p>Until then I remain open to the idea that it is better.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1087206, member: 2736"] I did some research on gain twist rifling to find out the reason for it in the first place. As I understand it, The problem with standard rifling is that with High speed projectiles is there tendency to shear the engraving in the bullets because of inertia at firing. old worn out barrels are notorious about this because the lands are worn down and have rounded edges that allow the bullet to jump the rifling to some degree. When the rifling is very fast it has the same tendency and will slip the bullet jacket if it starts to fast. the bonded bullets and the mono material bullets have solved the jacket slipping problem and minimized the need for gain twist rifling in many peoples minds. The Germans started messing with it to hopefully solve the accuracy problems on there really big guns that had to start a 4000 pound+ projectile rotating. They finally determined the solution was to cut many lands and grooves to give the engraving as much surface area as possible to solved the problem. The new technology in large heavy projectiles is to use fins to rotate the projectile and use a smooth bore. It is one of those things that make a lot of sense, but from a practical stand point has not been proven to be better. As someone said ; when someone wins a big bench rest match with a gain twist barrel then it may prove to be better. Until then I remain open to the idea that it is better. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bartlein gain twist barrel
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