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Hunting
Long Range Hunting & Shooting
Barrel length and twist question
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<blockquote data-quote="Randy Tidwell" data-source="post: 1617777" data-attributes="member: 109136"><p>Correction to my previous post regarding RPM. I went back to my spread sheet, my memory was off (I'm getting old).</p><p></p><p>I entered 3200 fps into the spread sheet, here are the results.</p><p></p><p>7.5 Twist 307,200 rpm</p><p>8 Twist 288,000 rpm</p><p>8.5 Twist 271,059 rpm</p><p>9 Twist 256,000 rpm</p><p>10 Twist 230,400 rpm</p><p>11 Twist 209,455 rpm</p><p>12 Twist 192,000 rpm</p><p>14 Twist 164,571 rpm</p><p></p><p>Changing the velocity to 3400 fps results in the following:</p><p></p><p>7.5 Twist 326,400 rpm</p><p>8 Twist 306,000 rpm</p><p>8.5 Twist 288,000 rpm</p><p>9 Twist 272,000 rpm</p><p>10 Twist 244,800 rpm</p><p>11 Twist 222,545 rpm</p><p>12 Twist 204,000 rpm</p><p>14 Twist 174,857 rpm</p><p></p><p>Not sure why I can't upload the spread sheet? But if anyone wants it, just PM with your email address. Or email me at <a href="mailto:randytidwellsales@gmail.com">randytidwellsales@gmail.com</a></p></blockquote><p></p>
[QUOTE="Randy Tidwell, post: 1617777, member: 109136"] Correction to my previous post regarding RPM. I went back to my spread sheet, my memory was off (I'm getting old). I entered 3200 fps into the spread sheet, here are the results. 7.5 Twist 307,200 rpm 8 Twist 288,000 rpm 8.5 Twist 271,059 rpm 9 Twist 256,000 rpm 10 Twist 230,400 rpm 11 Twist 209,455 rpm 12 Twist 192,000 rpm 14 Twist 164,571 rpm Changing the velocity to 3400 fps results in the following: 7.5 Twist 326,400 rpm 8 Twist 306,000 rpm 8.5 Twist 288,000 rpm 9 Twist 272,000 rpm 10 Twist 244,800 rpm 11 Twist 222,545 rpm 12 Twist 204,000 rpm 14 Twist 174,857 rpm Not sure why I can't upload the spread sheet? But if anyone wants it, just PM with your email address. Or email me at [email]randytidwellsales@gmail.com[/email] [/QUOTE]
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