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7mm Remington Mag Shooters
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<blockquote data-quote="BallisticsGuy" data-source="post: 1403782" data-attributes="member: 96226"><p>Shooing Berger 180's a 9 twist is totally sufficient at 7RM velocities. Minimum Sg is 1.4xx and on the high end it's over 1.6. That's solid country to be in right there. </p><p></p><p>I just did the math using the 180ELD specs and I see it getting 1.6Sg's on a 9 twist at 1000' doing 2950fps at 90F and 1.4 at 20F. A 9 twist is just perfect for them. </p><p></p><p>When using the 183 SMK on the other hand an 8.5 twist is sufficient at magnum velocities in relatively thin air but an 8 twist becomes a good idea especially if you venture into the wilds when it's literally freezing cold as the Sg drops a bit much in cold air on an 8.5.</p><p></p><p>If you want to shoot really far, like deep transonic you need tractability which is enhanced by not overspinning your bullet.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1403782, member: 96226"] Shooing Berger 180's a 9 twist is totally sufficient at 7RM velocities. Minimum Sg is 1.4xx and on the high end it's over 1.6. That's solid country to be in right there. I just did the math using the 180ELD specs and I see it getting 1.6Sg's on a 9 twist at 1000' doing 2950fps at 90F and 1.4 at 20F. A 9 twist is just perfect for them. When using the 183 SMK on the other hand an 8.5 twist is sufficient at magnum velocities in relatively thin air but an 8 twist becomes a good idea especially if you venture into the wilds when it's literally freezing cold as the Sg drops a bit much in cold air on an 8.5. If you want to shoot really far, like deep transonic you need tractability which is enhanced by not overspinning your bullet. [/QUOTE]
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