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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
18" 7mm SAUM twist rate
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<blockquote data-quote="jebel" data-source="post: 2086049" data-attributes="member: 106189"><p>It's convenient for us to think twist correlates to weight, but that's not really right. Holding all else constant, increasing weight actually improves stability. But things aren't constant when we increase weight, length also increases and the increased length erodes stability (swamping any improvement from increased weight).</p><p></p><p>So using a rule-of-thumb for weight to twist is a crude measure. Easiest way to see that is look at some monolithics where, in this case, you likely need 1:8.5 or better to stabilize 155gr bullets.</p><p></p><p>If you need a rule-of-thumb, longer bullets require more twist and shorter ones require less.</p></blockquote><p></p>
[QUOTE="jebel, post: 2086049, member: 106189"] It’s convenient for us to think twist correlates to weight, but that’s not really right. Holding all else constant, increasing weight actually improves stability. But things aren’t constant when we increase weight, length also increases and the increased length erodes stability (swamping any improvement from increased weight). So using a rule-of-thumb for weight to twist is a crude measure. Easiest way to see that is look at some monolithics where, in this case, you likely need 1:8.5 or better to stabilize 155gr bullets. If you need a rule-of-thumb, longer bullets require more twist and shorter ones require less. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
18" 7mm SAUM twist rate
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