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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet RPM and performance
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<blockquote data-quote="hoffbill" data-source="post: 2525577" data-attributes="member: 75091"><p>Bullet RPM's are the result of the combination of twist rate and muzzle velocity. A heavier bullet fired from the same case will likely have less velocity, and therefore may require a faster twist rate to achieve sufficient RPM's to be stable. For the same reason a lighter bullet fired from the same case will tend to have higher velocity thus the fast twist rate may create too many RPM's resulting in deforming or disintegration. Any bullet is going to have a velocity range that give optimum terminal performance on impact which will be based on the construction and materials of that bullet. Seems to me that optimum terminal performance will depend on impact velocity and whether that bullet is stable at that velocity. That is what will give best mushrooming and RPM has little to do with that other than providing the stability since the RPM will go to zero almost instantly on impact.</p></blockquote><p></p>
[QUOTE="hoffbill, post: 2525577, member: 75091"] Bullet RPM's are the result of the combination of twist rate and muzzle velocity. A heavier bullet fired from the same case will likely have less velocity, and therefore may require a faster twist rate to achieve sufficient RPM's to be stable. For the same reason a lighter bullet fired from the same case will tend to have higher velocity thus the fast twist rate may create too many RPM's resulting in deforming or disintegration. Any bullet is going to have a velocity range that give optimum terminal performance on impact which will be based on the construction and materials of that bullet. Seems to me that optimum terminal performance will depend on impact velocity and whether that bullet is stable at that velocity. That is what will give best mushrooming and RPM has little to do with that other than providing the stability since the RPM will go to zero almost instantly on impact. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet RPM and performance
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