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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5x55 se twist rate
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<blockquote data-quote="benchracer" data-source="post: 1346730" data-attributes="member: 22069"><p>"Heavy loads" don't affect this equation at all. Will a 1:8.66 twist work with 140 grain bullets? Depends on the bullet. Bullet length, more than bullet weight, is what determines the twist rate needed for full stability and full bc. If you plan to shoot 140 grain Nosler Partitions, a 9 twist is adequate and your 8.66 twist will do just fine.</p><p></p><p>I have a .264 WM and a 6.5x55, both with 9 twist. Both rifles shoot Berger 140 VLD's very accurately. However, they are not fully stabilized, which reduces the effective bc and takes away some of the advantage of shooting VLD's. Just as in my rifles, the 8.66 twist will likely shoot well with the more streamlined 140's, but it will do so with a degraded bc.</p><p></p><p>Keep in mind that better 6.5 bullets continue to be released. The Berger 140 Hybrid seems to require a bit more twist than the VLD. Hornady has a 143 ELD-X and a 147 ELD-M in production. Berger has plans to release a 155 Elite Hunter Hybrid in the near future.</p><p></p><p>A 9 twist, or an 8.66 twist, will work with a lot of very good 6.5mm bullets, but an 8 twist, or faster, is a better option that is likely to work with a much wider range of bullets.</p></blockquote><p></p>
[QUOTE="benchracer, post: 1346730, member: 22069"] "Heavy loads" don't affect this equation at all. Will a 1:8.66 twist work with 140 grain bullets? Depends on the bullet. Bullet length, more than bullet weight, is what determines the twist rate needed for full stability and full bc. If you plan to shoot 140 grain Nosler Partitions, a 9 twist is adequate and your 8.66 twist will do just fine. I have a .264 WM and a 6.5x55, both with 9 twist. Both rifles shoot Berger 140 VLD's very accurately. However, they are not fully stabilized, which reduces the effective bc and takes away some of the advantage of shooting VLD's. Just as in my rifles, the 8.66 twist will likely shoot well with the more streamlined 140's, but it will do so with a degraded bc. Keep in mind that better 6.5 bullets continue to be released. The Berger 140 Hybrid seems to require a bit more twist than the VLD. Hornady has a 143 ELD-X and a 147 ELD-M in production. Berger has plans to release a 155 Elite Hunter Hybrid in the near future. A 9 twist, or an 8.66 twist, will work with a lot of very good 6.5mm bullets, but an 8 twist, or faster, is a better option that is likely to work with a much wider range of bullets. [/QUOTE]
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6.5x55 se twist rate
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