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Hunting
Long Range Hunting & Shooting
Barrel length vs Stability?
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<blockquote data-quote="lancetkenyon" data-source="post: 3084612" data-attributes="member: 68875"><p>Try and keep RPMs to around 300k-320k max if using cup & core bullets.</p><p></p><p>(Velocity x 720) ÷ twist rate. </p><p></p><p>Thin-skinned copper jackets can start to let loose above that 320-330k RPM rate. </p><p></p><p>Monos do fine on fast twist.</p><p></p><p>Heavier bullets need faster twist to stabilize properly.</p><p></p><p>I have a bunch of 6.5mms w. 1:7.5" twists. The 130s do just fine in them. </p><p></p><p>Fastest RPM round I shoot is a 22GT w. 1:7". 77TMKs @ 3200 are at 329k RPM. They are wicked accurate still, and absolutely crush coyotes with the terminal velocity on impact. </p><p></p><p>If a 1:10" .308 won't shoot a 140gr well @ 3000fps, I highly doubt the twist rate is to blame. That is only going to be in the 216k RPM range. Pretty slow spin rate actually.</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 3084612, member: 68875"] Try and keep RPMs to around 300k-320k max if using cup & core bullets. (Velocity x 720) ÷ twist rate. Thin-skinned copper jackets can start to let loose above that 320-330k RPM rate. Monos do fine on fast twist. Heavier bullets need faster twist to stabilize properly. I have a bunch of 6.5mms w. 1:7.5" twists. The 130s do just fine in them. Fastest RPM round I shoot is a 22GT w. 1:7". 77TMKs @ 3200 are at 329k RPM. They are wicked accurate still, and absolutely crush coyotes with the terminal velocity on impact. If a 1:10" .308 won't shoot a 140gr well @ 3000fps, I highly doubt the twist rate is to blame. That is only going to be in the 216k RPM range. Pretty slow spin rate actually. [/QUOTE]
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Barrel length vs Stability?
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