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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Transitional/Progressive/Gain Twist Barrels aid in accuracy?
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<blockquote data-quote="J E Custom" data-source="post: 1029884" data-attributes="member: 2736"><p>The gain twist has been around since before WW 2 and many experiments and trials have been performed to find out if it was a better system of rifling. (In theory, it seams to be the answer to many of the problems the bullet has to deal with). but no one has ever proved that it was better and in fact, some opinions are that it is not as good as standard rifling.</p><p></p><p>In manufacturing barrels, most are slightly smaller on one end than the other (.00001 to .00005)</p><p>and most of the barrel makers will mark the small end so it can be installed at the muzzle. (The</p><p>theory is that as the bullet goes down the barrel and some of it is worn off on the lands and grooves , it will remain tighter for better accuracy) again, just another theory that is hard to prove.</p><p></p><p>With ultra high velocity, it makes sense to start the bullet slower and increase twist as it proceeds down the barrel to lower the chance of jacket separation from the core. But with bonded core bullets and monolithic solid bullets, this problem has been minimized .</p><p></p><p>I do think if it was even slightly better It would be in most if not all match rifles.</p><p></p><p>Just an opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1029884, member: 2736"] The gain twist has been around since before WW 2 and many experiments and trials have been performed to find out if it was a better system of rifling. (In theory, it seams to be the answer to many of the problems the bullet has to deal with). but no one has ever proved that it was better and in fact, some opinions are that it is not as good as standard rifling. In manufacturing barrels, most are slightly smaller on one end than the other (.00001 to .00005) and most of the barrel makers will mark the small end so it can be installed at the muzzle. (The theory is that as the bullet goes down the barrel and some of it is worn off on the lands and grooves , it will remain tighter for better accuracy) again, just another theory that is hard to prove. With ultra high velocity, it makes sense to start the bullet slower and increase twist as it proceeds down the barrel to lower the chance of jacket separation from the core. But with bonded core bullets and monolithic solid bullets, this problem has been minimized . I do think if it was even slightly better It would be in most if not all match rifles. Just an opinion J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Transitional/Progressive/Gain Twist Barrels aid in accuracy?
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