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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate, how fast is too fast?
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<blockquote data-quote="Mikecr" data-source="post: 2458497" data-attributes="member: 1521"><p>My formula would not work where there is not enough energy to destroy bullets.</p><p>2 scenarios:</p><p>7tw, 6BR, 95gr VLDs at 3000fps, 309 KRPM</p><p>8tw, 243AI, 95gr VLDs at 3400fps, 306 KRPM</p><p></p><p>They both hit my KRPM Limit of 305 for 24cal, and you could find a few 243AIs killing bullets.</p><p>But you're unlikely to find a 6BR killing ANY bullets. It's just not enough heat and obturation energy.</p><p></p><p>So it is an important caveat to my formula that it only applies while at the <strong>correct twist</strong> for the bullet.</p><p>The correct twist in this scenario,, for this bullet, is 9tw. </p><p>You'd have to drive the bullet at 3850fps in 9tw to hit my 305 KRPM limit, and that is plenty of energy applied (for sure).</p><p>You would see failures right there.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2458497, member: 1521"] My formula would not work where there is not enough energy to destroy bullets. 2 scenarios: 7tw, 6BR, 95gr VLDs at 3000fps, 309 KRPM 8tw, 243AI, 95gr VLDs at 3400fps, 306 KRPM They both hit my KRPM Limit of 305 for 24cal, and you could find a few 243AIs killing bullets. But you're unlikely to find a 6BR killing ANY bullets. It's just not enough heat and obturation energy. So it is an important caveat to my formula that it only applies while at the [B]correct twist[/B] for the bullet. The correct twist in this scenario,, for this bullet, is 9tw. You'd have to drive the bullet at 3850fps in 9tw to hit my 305 KRPM limit, and that is plenty of energy applied (for sure). You would see failures right there. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Twist rate, how fast is too fast?
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