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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Differences in velocity
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<blockquote data-quote="Bart B" data-source="post: 659979" data-attributes="member: 5302"><p>Well, a faster twist means the angle the rifling presents to the bullet is greater and that'll increase the resistance the bullet meets as it starts into the rifling. So muzzle velocity will change just like increased neck tension on the bullet does; it goes up. How much may be hard to measure 'cause in reality, it's probably not more than a few feet per second. A bullet entering a 1:9 twist barrel may leave 2 to 3 fps faster than a 1:10 twist one.</p><p></p><p>And I've never seen any load data suggesting the powder charge be decreased a bit for faster twist barrels.</p></blockquote><p></p>
[QUOTE="Bart B, post: 659979, member: 5302"] Well, a faster twist means the angle the rifling presents to the bullet is greater and that'll increase the resistance the bullet meets as it starts into the rifling. So muzzle velocity will change just like increased neck tension on the bullet does; it goes up. How much may be hard to measure 'cause in reality, it's probably not more than a few feet per second. A bullet entering a 1:9 twist barrel may leave 2 to 3 fps faster than a 1:10 twist one. And I've never seen any load data suggesting the powder charge be decreased a bit for faster twist barrels. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Differences in velocity
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