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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Variable barrel twist.
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<blockquote data-quote="Varminator 911" data-source="post: 369660" data-attributes="member: 9705"><p>You won't want a long stretch of smoothbore, usually called freebore, because accuracy would probably be bad. Also when the bullet finnally hit the rifling at 1500-2000 fps, it would be hard on the jacket. Gain twist is used when a very fast twist is needed for a very long bullet. Some of the bullets being tested now are 7 calibers long, 7 x .338 = 2.37 inches long. Even in 338 this might need a 5 or 6 twist. You can't start at 5 or 6 so they might start at 10 and finish at 6. </p><p></p><p>I've read that anything faster than 7 twist at the start and the bullet may skid rather than take the rifling as it should. But this may be caliber dependent and is certainly somewhat dependent on bullet type and design. </p><p></p><p>Many of those really long bullets are monometals and have driving bands.</p></blockquote><p></p>
[QUOTE="Varminator 911, post: 369660, member: 9705"] You won't want a long stretch of smoothbore, usually called freebore, because accuracy would probably be bad. Also when the bullet finnally hit the rifling at 1500-2000 fps, it would be hard on the jacket. Gain twist is used when a very fast twist is needed for a very long bullet. Some of the bullets being tested now are 7 calibers long, 7 x .338 = 2.37 inches long. Even in 338 this might need a 5 or 6 twist. You can't start at 5 or 6 so they might start at 10 and finish at 6. I've read that anything faster than 7 twist at the start and the bullet may skid rather than take the rifling as it should. But this may be caliber dependent and is certainly somewhat dependent on bullet type and design. Many of those really long bullets are monometals and have driving bands. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Variable barrel twist.
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