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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet RPM Per Inch Math Problem
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<blockquote data-quote="Tumbleweed" data-source="post: 2100192" data-attributes="member: 9281"><p>Hey all. I've been interested in calculating a hunting projectile's rpm per inch of travel. In other words, I'd find it very interesting when comparing twist rates to know how many times a bullet will rotate in say 12" of animal. Many have seen the benefits of faster bullet rpm's creating more devastating wounds and fragmentation. I.E. 215 Berger out of 10 twist vs. 215 Berger out of 9 twist. Being able to calculate this and compare different twist rates and their effect is useful to me.</p><p></p><p>Coming up with bullet rpm at the target is easy, it's the distance of travel that I struggle to make the connection on...mathematical shortcomings. Ha ha! Also, some suggest only a 10% decline in bullet rpm at the target but there's no real data available on this. Can someone who is much better at math than me come up with this formula and spell out the process for me? Thank you!</p><p>Jesse</p></blockquote><p></p>
[QUOTE="Tumbleweed, post: 2100192, member: 9281"] Hey all. I've been interested in calculating a hunting projectile's rpm per inch of travel. In other words, I'd find it very interesting when comparing twist rates to know how many times a bullet will rotate in say 12" of animal. Many have seen the benefits of faster bullet rpm's creating more devastating wounds and fragmentation. I.E. 215 Berger out of 10 twist vs. 215 Berger out of 9 twist. Being able to calculate this and compare different twist rates and their effect is useful to me. Coming up with bullet rpm at the target is easy, it's the distance of travel that I struggle to make the connection on...mathematical shortcomings. Ha ha! Also, some suggest only a 10% decline in bullet rpm at the target but there's no real data available on this. Can someone who is much better at math than me come up with this formula and spell out the process for me? Thank you! Jesse [/QUOTE]
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Bullet RPM Per Inch Math Problem
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