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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 prc heavy bullet twist rate
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<blockquote data-quote="EricRF" data-source="post: 1876403" data-attributes="member: 104591"><p>I called Berger and they said 1:8 usually works fine, but 1:7.75 or 1:7.5 is ideal. I still went with a 1:7 twist for my 6.5 PRC that is being built for better stability with the monometals in addition to the Berger. The problem that you might run into is too fast of RPMs if you jack up velocity. I read that you want to keep it under 300,000 RPMs. Formula Being Velocity x 720 / twist rate. So at 3000fps, your RPMs would be 308,000. A little above that general rule of thumb, but I think it should be ok. Browning is now chambering most of their 6.5s in 1:7 twists too.</p></blockquote><p></p>
[QUOTE="EricRF, post: 1876403, member: 104591"] I called Berger and they said 1:8 usually works fine, but 1:7.75 or 1:7.5 is ideal. I still went with a 1:7 twist for my 6.5 PRC that is being built for better stability with the monometals in addition to the Berger. The problem that you might run into is too fast of RPMs if you jack up velocity. I read that you want to keep it under 300,000 RPMs. Formula Being Velocity x 720 / twist rate. So at 3000fps, your RPMs would be 308,000. A little above that general rule of thumb, but I think it should be ok. Browning is now chambering most of their 6.5s in 1:7 twists too. [/QUOTE]
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6.5 prc heavy bullet twist rate
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