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Hunting
Long Range Hunting & Shooting
Effect of Bullet Spin on Terminal Performance
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<blockquote data-quote="Greyfox" data-source="post: 1694915" data-attributes="member: 10291"><p>IMO, the rate of spin alone given an un-damaged or weakened jacket would have little difference in terminal effect in game. Differences in terminal ballistics can be caused by twist rate when it effects the bullets jacket integrity and the RPM's approach or exceed the "blow-up" threshold. This is commonly seen when shooting lightly constructed, frangible varmint bullets at high velocity and fast twist rates. </p><p></p><p>This is a formula determining twist rate RPM's. The RPM's for bullet core separation/blow-up which occurs at 310,000 to 330,000 RPM's. </p><p>(Muzzle velocity) x (720) /twist-rate =RPM</p><p>Blasting a 6.5mm lead core bullet at 3300FPS with a fast twist(7.5), would result in 317,000 RPM's ...potentially a recipe for erratic bullet performance. </p><p> I think it is quite possible that a bullet that is near, or at he threshold will be in weakened state and show a difference in terminal effect on game .....if it doesn't blow up before it even reaches the animal....IMO</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1694915, member: 10291"] IMO, the rate of spin alone given an un-damaged or weakened jacket would have little difference in terminal effect in game. Differences in terminal ballistics can be caused by twist rate when it effects the bullets jacket integrity and the RPM’s approach or exceed the “blow-up” threshold. This is commonly seen when shooting lightly constructed, frangible varmint bullets at high velocity and fast twist rates. This is a formula determining twist rate RPM’s. The RPM’s for bullet core separation/blow-up which occurs at 310,000 to 330,000 RPM’s. (Muzzle velocity) x (720) /twist-rate =RPM Blasting a 6.5mm lead core bullet at 3300FPS with a fast twist(7.5), would result in 317,000 RPM’s ...potentially a recipe for erratic bullet performance. I think it is quite possible that a bullet that is near, or at he threshold will be in weakened state and show a difference in terminal effect on game .....if it doesn’t blow up before it even reaches the animal....IMO [/QUOTE]
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Effect of Bullet Spin on Terminal Performance
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