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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate, how fast is too fast?
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<blockquote data-quote="Lenny Foffa" data-source="post: 2458574" data-attributes="member: 100742"><p>Please allow a couple of stupid questions. Since I shoot an over bore cartridge from the 70"s . A 270 Weatherby Mag. I am trying to keep up. with the rest of you. </p><p>#1, How does one determine the RPM of the projectile to such a fine number like 300KRPM or 309KRPM ect?? Is there a specific math formula ? #2 Does the load you develop , (same Bullet in the same barrel) )based on expected Muz Vel change the RPM of the projectile? (Example a 2900 fps Muzz Vel. load vs a 3000fps velocity load ) and #3 What numerical value does SG represent? Thank you for your patience and response</p></blockquote><p></p>
[QUOTE="Lenny Foffa, post: 2458574, member: 100742"] Please allow a couple of stupid questions. Since I shoot an over bore cartridge from the 70"s . A 270 Weatherby Mag. I am trying to keep up. with the rest of you. #1, How does one determine the RPM of the projectile to such a fine number like 300KRPM or 309KRPM ect?? Is there a specific math formula ? #2 Does the load you develop , (same Bullet in the same barrel) )based on expected Muz Vel change the RPM of the projectile? (Example a 2900 fps Muzz Vel. load vs a 3000fps velocity load ) and #3 What numerical value does SG represent? Thank you for your patience and response [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate, how fast is too fast?
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