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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rates and Velocity?
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<blockquote data-quote="Chris F" data-source="post: 778018" data-attributes="member: 1181"><p>I can add another couple of data points for you regarding twist and effect on velocity. </p><p>From the empirical side, I'm a Service Rifle competitor and we're shooting 20" AR's in 223 Rem with fast twists (1 in 8 or better). I've played with 9, 8, 7 and 6.5 twist barrels shooting pretty much the same loads (77 gr Sierra at about 2675 to 2700 over a chrono. In my experience there wasn't a difference I could see attributable to the twist.</p><p></p><p>From the theoretical side, Bob Rinker addressed this question in his book "Understanding Ballistics". He calculated the amount of energy required to spin a bullet and came to the following conclusion:</p></blockquote><p></p>
[QUOTE="Chris F, post: 778018, member: 1181"] I can add another couple of data points for you regarding twist and effect on velocity. From the empirical side, I'm a Service Rifle competitor and we're shooting 20" AR's in 223 Rem with fast twists (1 in 8 or better). I've played with 9, 8, 7 and 6.5 twist barrels shooting pretty much the same loads (77 gr Sierra at about 2675 to 2700 over a chrono. In my experience there wasn't a difference I could see attributable to the twist. From the theoretical side, Bob Rinker addressed this question in his book "Understanding Ballistics". He calculated the amount of energy required to spin a bullet and came to the following conclusion: [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Twist Rates and Velocity?
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