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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
twist rate
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<blockquote data-quote="Bart B" data-source="post: 617893" data-attributes="member: 5302"><p>Every bullet needs to be spun at a narrow rpm range to stabilize it in flight all the way to the target; even targets a long ways away. It doesn't matter what their muzzle velocity is as long as they're spinning at the best rpm to make them accurate. A given bullet shot through a 1:10 twist barrel that's super accurate can be shot about 30% faster in a 1:13 twist and it'll shoot just as accurate.</p><p></p><p>Which is which it's wise to adjust the twist rate to the speed the bullet leaves at to stabilize it just right. Spin rate in rpm equals 720 multiplied by muzzle velocity divided by 12. A bullet leaving at 3000 fps from a 1:12 twist barrel's spinning at 180,000 rpm.</p></blockquote><p></p>
[QUOTE="Bart B, post: 617893, member: 5302"] Every bullet needs to be spun at a narrow rpm range to stabilize it in flight all the way to the target; even targets a long ways away. It doesn't matter what their muzzle velocity is as long as they're spinning at the best rpm to make them accurate. A given bullet shot through a 1:10 twist barrel that's super accurate can be shot about 30% faster in a 1:13 twist and it'll shoot just as accurate. Which is which it's wise to adjust the twist rate to the speed the bullet leaves at to stabilize it just right. Spin rate in rpm equals 720 multiplied by muzzle velocity divided by 12. A bullet leaving at 3000 fps from a 1:12 twist barrel's spinning at 180,000 rpm. [/QUOTE]
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twist rate
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