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Bullets Spinning Apart
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<blockquote data-quote="AZShooter" data-source="post: 1687850" data-attributes="member: 5219"><p>While I still use a 3 groove in a 257 weatherby with lots of velocity the twist is 1 in 10 so there are no issues with the 115 Berger VLDs. 265,104 rpm</p><p></p><p>I had a 5R bartlein 1 in 7.5 twist 6mm-284 that shot 105 berger hybrids at 3500 fps with no issues for life of barrel. 336,000 rpm</p><p></p><p>repeat from earlier post, two 1in 7 twist rifles with issues:</p><p>7 mag 180 VLD @ 2950 fps 303,428</p><p>7 STW " @ 3100 fps 318,857 </p><p></p><p>I realize this is not a good scientific control but that 6mm-284 created higher RPMs yet the Berger hybrid survived the journey for the entire barrel life. I would say that a 5 groove would be better than a 3 groove with twist of 1 in 8 or faster.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1687850, member: 5219"] While I still use a 3 groove in a 257 weatherby with lots of velocity the twist is 1 in 10 so there are no issues with the 115 Berger VLDs. 265,104 rpm I had a 5R bartlein 1 in 7.5 twist 6mm-284 that shot 105 berger hybrids at 3500 fps with no issues for life of barrel. 336,000 rpm repeat from earlier post, two 1in 7 twist rifles with issues: 7 mag 180 VLD @ 2950 fps 303,428 7 STW " @ 3100 fps 318,857 I realize this is not a good scientific control but that 6mm-284 created higher RPMs yet the Berger hybrid survived the journey for the entire barrel life. I would say that a 5 groove would be better than a 3 groove with twist of 1 in 8 or faster. [/QUOTE]
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