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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="nkyshooter" data-source="post: 2024404" data-attributes="member: 83787"><p>Greater, less, more, faster, slower, etc - it IS a bit confusing until you realize it is just 'backwards' ...</p><p></p><p>1 twist in 8 inches will stabilize bullets longer than a 1 twist in 9 inches will ... and 1 twist in 7 will stabilize bullets longer than a 1 twist in 8 can.</p><p></p><p>So 1 in 8 or "more" means 1 in 8 or "faster" ... the lower the number, the 'faster' the twist and therefore the longer the bullet it will stabilize.</p><p></p><p>As others have said though - we really only want to go to "fast enough" and not faster ("low enough and not lower") ... I have a 1 in 7 twist 223 that separates the jackets from the core as the barrel begins to heat up when shooting 50gr varmint bullets. But, I can shoot very heavy for 22 cal vld's quite accurately and subsequently leverage the higher BC's and get to 1000 yards easily with it.</p><p></p><p>For the Berger 140 vld, 1 twist in 8 is optimal ... you'll be able to shoot 140's in a 7 and probably in a 9 but will get best blend of stability at all altitudes and muzzle velocity with the 8 twist. If you think you might shoot the 156's, then get a "faster" 1 in 7 twist and know that you "may" sacrifice some muzzle velocity and "may" sacrifice some accuracy the lighter you go until you eventually find the point you are separating jackets from cores by spinning them so rapidly.</p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="nkyshooter, post: 2024404, member: 83787"] Greater, less, more, faster, slower, etc - it IS a bit confusing until you realize it is just 'backwards' ... 1 twist in 8 inches will stabilize bullets longer than a 1 twist in 9 inches will ... and 1 twist in 7 will stabilize bullets longer than a 1 twist in 8 can. So 1 in 8 or "more" means 1 in 8 or "faster" ... the lower the number, the 'faster' the twist and therefore the longer the bullet it will stabilize. As others have said though - we really only want to go to "fast enough" and not faster ("low enough and not lower") ... I have a 1 in 7 twist 223 that separates the jackets from the core as the barrel begins to heat up when shooting 50gr varmint bullets. But, I can shoot very heavy for 22 cal vld's quite accurately and subsequently leverage the higher BC's and get to 1000 yards easily with it. For the Berger 140 vld, 1 twist in 8 is optimal ... you'll be able to shoot 140's in a 7 and probably in a 9 but will get best blend of stability at all altitudes and muzzle velocity with the 8 twist. If you think you might shoot the 156's, then get a "faster" 1 in 7 twist and know that you "may" sacrifice some muzzle velocity and "may" sacrifice some accuracy the lighter you go until you eventually find the point you are separating jackets from cores by spinning them so rapidly. Cheers [/QUOTE]
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Berger Twist Rate Stability Calculator (need help)
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