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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rates and Velocity?
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<blockquote data-quote="Cold Trigger Finger" data-source="post: 778256" data-attributes="member: 56732"><p>I guess I'm just cheap, as I get sick of "Standard " twist barrels.</p><p> To get a useful barrel in the 223 , 22/250 , 220 Swift, and most others, a factory rifle needs to be rebarreled . </p><p></p><p> A 9" twist 223 with a 24" barrel will push a naked 70 gr TSX 3000 fps. An awesome bullet at a very useful velocity. But that combo produces oval holes in the target and from 3/4"-12" groups/ patterns at 100 yards.</p><p> If the bullets are pushed fast enough to stabilize at close range when the bullet slows sufficiently it will become unstable again. Most other calibers are similar or worse tho the 6.5 s should be standardized with a 7.5" </p><p></p><p> Art Alphin / A-Square did a lot of work with twist rates in the larger calibers and had great results. My last 416 Rem had a 10" twist and that twist, tho 4" faster than standard was in no way a liability. It did cause slightly higher pressure. I had to use slightly slower powder. But still got book velocity.</p></blockquote><p></p>
[QUOTE="Cold Trigger Finger, post: 778256, member: 56732"] I guess I'm just cheap, as I get sick of "Standard " twist barrels. To get a useful barrel in the 223 , 22/250 , 220 Swift, and most others, a factory rifle needs to be rebarreled . A 9" twist 223 with a 24" barrel will push a naked 70 gr TSX 3000 fps. An awesome bullet at a very useful velocity. But that combo produces oval holes in the target and from 3/4"-12" groups/ patterns at 100 yards. If the bullets are pushed fast enough to stabilize at close range when the bullet slows sufficiently it will become unstable again. Most other calibers are similar or worse tho the 6.5 s should be standardized with a 7.5" Art Alphin / A-Square did a lot of work with twist rates in the larger calibers and had great results. My last 416 Rem had a 10" twist and that twist, tho 4" faster than standard was in no way a liability. It did cause slightly higher pressure. I had to use slightly slower powder. But still got book velocity. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rates and Velocity?
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