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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel twist rate's affect on pressure
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<blockquote data-quote="goodkid1" data-source="post: 1678177" data-attributes="member: 102436"><p>Sorry...I failed to attach the cited quote in my response above. Here it is...</p><p></p><p>Twist rate starts to effect chamber pressure around 1/4 twist and faster. 1/3 twist would have a significant effect.</p><p></p><p>There is no difference between 1/8 and 1/7.</p><p></p><p>Also no difference between 1/7 and 1/12 in 5.56mm.</p><p></p><p>The 6.8 world believed that 1/9 would raise pressures over 1/11. This was due to an invalid test that everyone cited.</p><p></p><p>I told them they were wrong for years, and eventually they figured it out after Bison made a 1/7 twist barrel and it didn't raise pressure.</p></blockquote><p></p>
[QUOTE="goodkid1, post: 1678177, member: 102436"] Sorry...I failed to attach the cited quote in my response above. Here it is... Twist rate starts to effect chamber pressure around 1/4 twist and faster. 1/3 twist would have a significant effect. There is no difference between 1/8 and 1/7. Also no difference between 1/7 and 1/12 in 5.56mm. The 6.8 world believed that 1/9 would raise pressures over 1/11. This was due to an invalid test that everyone cited. I told them they were wrong for years, and eventually they figured it out after Bison made a 1/7 twist barrel and it didn't raise pressure. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrel twist rate's affect on pressure
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