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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What twist?
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<blockquote data-quote="Dragoon300" data-source="post: 2284047" data-attributes="member: 115285"><p>The first M16's in Vietnam had a 1:14 twist, just as the Winchester model 70 220 Swift had for many years for it's 48 grain ammo. The M16-A1 had 1:12 twist, they were meant to fire 55 grain FMJ ball. Remington 22-250's had the 1:12 twist also for 55 grain ammo.</p><p>The 1:7 twist came along much later for 62 grain M855 green tip (SS-109 projectile) ammo, and don't usually shoot good groups with 55 grain loads.</p><p>Generally heavier bullets need faster twist rates, however it's really because they are longer. Now we see high ballistic coefficient bullets that are very long for their caliber and sometimes weight, that need faster twist rates to stabilize.</p></blockquote><p></p>
[QUOTE="Dragoon300, post: 2284047, member: 115285"] The first M16's in Vietnam had a 1:14 twist, just as the Winchester model 70 220 Swift had for many years for it's 48 grain ammo. The M16-A1 had 1:12 twist, they were meant to fire 55 grain FMJ ball. Remington 22-250's had the 1:12 twist also for 55 grain ammo. The 1:7 twist came along much later for 62 grain M855 green tip (SS-109 projectile) ammo, and don't usually shoot good groups with 55 grain loads. Generally heavier bullets need faster twist rates, however it's really because they are longer. Now we see high ballistic coefficient bullets that are very long for their caliber and sometimes weight, that need faster twist rates to stabilize. [/QUOTE]
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What twist?
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