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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
240 weatherby twist rate
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<blockquote data-quote="Lefty7mmstw" data-source="post: 743348" data-attributes="member: 48043"><p>twice the fps eh.. had to wake up first on this one as I worked over-night last night</p><p> </p><p><strong>Bullet RPM = MV X 720/Twist Rate (in inches) so a 3000 fps bullet from an 8" twist is spinning 270,000 rpm</strong></p><p> </p><p><strong>a 3300 fps bullet from a 9" twist is spinning 264,000 rpm, or less than 1% difference. </strong></p><p> </p><p><strong>I'll dare you later to get a 105 in a 243 later to 3000 fps even , most likely would be 2900 to 2950, so you are actually talking fewer rpm from the slower cal. with the faster twist.... </strong></p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 743348, member: 48043"] twice the fps eh.. had to wake up first on this one as I worked over-night last night [B]Bullet RPM = MV X 720/Twist Rate (in inches) so a 3000 fps bullet from an 8" twist is spinning 270,000 rpm[/B] [B]a 3300 fps bullet from a 9" twist is spinning 264,000 rpm, or less than 1% difference. [/B] [B]I'll dare you later to get a 105 in a 243 later to 3000 fps even , most likely would be 2900 to 2950, so you are actually talking fewer rpm from the slower cal. with the faster twist.... [/B] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
240 weatherby twist rate
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