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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Changed Berger B.C.
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<blockquote data-quote="BryanLitz" data-source="post: 251202" data-attributes="member: 7848"><p>The recommended twists insure stability from the lowest reasonably expected muzzle velocities in the worst reasonably expected environmental conditions. Increasing the velocity of the bullet, or shooting it in lower density air will improve the stability beyond the minimum required.</p><p></p><p>Required twist is not as strong a function of muzzle velocity as is commonly thought. In other words, if a .30 caliber bullet achieves marginal stability from a short .30BR, and that same bullet is fired from a big 300 Win Mag in the same twist barrel at a velocity that's 20 or 30% faster, that doesn't mean the magnum can do with 20 or 30% slower twist. Instead it will probably require only a 10% slower twist rate than the .30BR. </p><p></p><p>I know that was a very generic example. If you give me the specific bullet and expected velocity, I can be more specific about a recommended twist for that velocity.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 251202, member: 7848"] The recommended twists insure stability from the lowest reasonably expected muzzle velocities in the worst reasonably expected environmental conditions. Increasing the velocity of the bullet, or shooting it in lower density air will improve the stability beyond the minimum required. Required twist is not as strong a function of muzzle velocity as is commonly thought. In other words, if a .30 caliber bullet achieves marginal stability from a short .30BR, and that same bullet is fired from a big 300 Win Mag in the same twist barrel at a velocity that's 20 or 30% faster, that doesn't mean the magnum can do with 20 or 30% slower twist. Instead it will probably require only a 10% slower twist rate than the .30BR. I know that was a very generic example. If you give me the specific bullet and expected velocity, I can be more specific about a recommended twist for that velocity. -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Changed Berger B.C.
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