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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
220 Swift, twist rate, barrel length
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<blockquote data-quote="Mikecr" data-source="post: 1151862" data-attributes="member: 1521"><p>Bart, you're seriously confused about stability. </p><p>If stability was about RPMs, then this would be declared as such for bullets (it is not).</p><p>Stability is tied to displacement(relative) per turn, and 14" displacement per turn is too much for 70-80gr bullets -regardless of RPMs/velocity. That is, unless he's hunting from the summit of Mt. Everest.</p><p></p><p>He is right about 12tw or tighter, but not much tighter or he'll blow up light bullets at 220swift velocities.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1151862, member: 1521"] Bart, you're seriously confused about stability. If stability was about RPMs, then this would be declared as such for bullets (it is not). Stability is tied to displacement(relative) per turn, and 14" displacement per turn is too much for 70-80gr bullets -regardless of RPMs/velocity. That is, unless he's hunting from the summit of Mt. Everest. He is right about 12tw or tighter, but not much tighter or he'll blow up light bullets at 220swift velocities. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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220 Swift, twist rate, barrel length
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