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The Range
Ammo & Reloading
Which twist rate for heaver projectiles?
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<blockquote data-quote="SoonerP226" data-source="post: 2646813" data-attributes="member: 26737"><p>IIRC, you'll want 1:7 for that heavy of a bullet. As I understand it, 1:9 is generally fast enough for most .223/5.56 projectiles, and the 1:7 only came about because the Army wanted to be able to use the M249's heavier boolits in the M16. I don't recall exactly where the line was, but I think 70+gr falls in the 1:7 camp.</p></blockquote><p></p>
[QUOTE="SoonerP226, post: 2646813, member: 26737"] IIRC, you'll want 1:7 for that heavy of a bullet. As I understand it, 1:9 is generally fast enough for most .223/5.56 projectiles, and the 1:7 only came about because the Army wanted to be able to use the M249's heavier boolits in the M16. I don't recall exactly where the line was, but I think 70+gr falls in the 1:7 camp. [/QUOTE]
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Which twist rate for heaver projectiles?
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