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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="FEENIX" data-source="post: 2458620" data-attributes="member: 14204"><p>Bullet RPM quick version formula: MV x (720/barrel twist)</p><p> = 3000 FPS x (720/8)</p><p> = 270, 000 RPM</p><p></p><p>Yes, velocity will affect the RPM of the bullet</p><p> = 3000 FPS x (720/8) = 270, 000 RPM</p><p></p><p> = 2900 FPS x (720/8) = 261, 000 RPM</p><p></p><p>SG (gyroscopic stability factor) is what it takes to optimize (>1.5) the stability of a projectile in flight.</p><p></p><p><a href="https://bergerbullets.com/twist-rate-calculator/" target="_blank">https://bergerbullets.com/twist-rate-calculator/</a></p></blockquote><p></p>
[QUOTE="FEENIX, post: 2458620, member: 14204"] Bullet RPM quick version formula: MV x (720/barrel twist) = 3000 FPS x (720/8) = 270, 000 RPM Yes, velocity will affect the RPM of the bullet = 3000 FPS x (720/8) = 270, 000 RPM = 2900 FPS x (720/8) = 261, 000 RPM SG (gyroscopic stability factor) is what it takes to optimize (>1.5) the stability of a projectile in flight. [URL]https://bergerbullets.com/twist-rate-calculator/[/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate, how fast is too fast?
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