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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Twist Rate Stability Calculator (need help)
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<blockquote data-quote="Hugnot" data-source="post: 2024497" data-attributes="member: 115658"><p>The Miller stability estimator comes up with a Sg of 1.51 for the Berger .264, 140 VLD bullet, 1.421" long at 2800 fps, 8 twist, 50*. This should not be a surprise to anyone because they are sort of a standard 6.5 bullet and are used in many 6.5 rifles which have 8 twist barrels with great results. In any event, for a 6.5 a 8 twist is a sure bet. My 9 twist .260 does well with the 140 Si MK at 2000 ft. elevation on a warm day. I wish it had a 8 twist.</p><p></p><p>The Berger 140 VLD, at 35* and 3000 fps the Sg is 1.50 - stable & flying good. At 20* Sg 1.46, cold day, but still stable & flying good. Real life experience shows this bullet works well, the numbers give additional confidence.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2024497, member: 115658"] The Miller stability estimator comes up with a Sg of 1.51 for the Berger .264, 140 VLD bullet, 1.421" long at 2800 fps, 8 twist, 50*. This should not be a surprise to anyone because they are sort of a standard 6.5 bullet and are used in many 6.5 rifles which have 8 twist barrels with great results. In any event, for a 6.5 a 8 twist is a sure bet. My 9 twist .260 does well with the 140 Si MK at 2000 ft. elevation on a warm day. I wish it had a 8 twist. The Berger 140 VLD, at 35* and 3000 fps the Sg is 1.50 - stable & flying good. At 20* Sg 1.46, cold day, but still stable & flying good. Real life experience shows this bullet works well, the numbers give additional confidence. [/QUOTE]
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Berger Twist Rate Stability Calculator (need help)
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