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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
28 nosler, vapor trailing?
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<blockquote data-quote="hoffbill" data-source="post: 1977092" data-attributes="member: 75091"><p>Regarding twist rate the often overlooked variable is velocity. Twist rate combined with velocity determine the RPM of the bullet leaving the barrel. Every bullet has a minimum needed to be stable as well as an optimum for maximum stability. Excessive RPM's can result in bullet deforming or disintegrating. The reason heavier bullets may require faster twist rate than a lighter bullet of the same caliber and design is that the heavier bullet will generally have less velocity, thus requiring faster twist to achieve the same RPM. If you play with the math of twist rate, velocity and convert to RPM you will see that most bullets are in the 190,000 to 200,000 RPM range.</p><p></p><p>[URL unfurl="true"]https://www.accurateshooter.com/technical-articles/calculating-bullet-rpm-spin-rates-stability/[/URL]</p><p>or</p><p><strong>How to Calculate RPM - Calculating the RPM of a Moving Bullet</strong></p><p></p><ul> <li data-xf-list-type="ul">Determine the muzzle velocity of the bullet.</li> <li data-xf-list-type="ul">Determine the twist rate imparted by the barrel.</li> <li data-xf-list-type="ul">Convert the muzzle velocity into the same unit per second as the unit of the twist rate.</li> <li data-xf-list-type="ul">Divide by the result by the length of the twist rate.</li> <li data-xf-list-type="ul">Multiply by 60. </li> </ul></blockquote><p></p>
[QUOTE="hoffbill, post: 1977092, member: 75091"] Regarding twist rate the often overlooked variable is velocity. Twist rate combined with velocity determine the RPM of the bullet leaving the barrel. Every bullet has a minimum needed to be stable as well as an optimum for maximum stability. Excessive RPM's can result in bullet deforming or disintegrating. The reason heavier bullets may require faster twist rate than a lighter bullet of the same caliber and design is that the heavier bullet will generally have less velocity, thus requiring faster twist to achieve the same RPM. If you play with the math of twist rate, velocity and convert to RPM you will see that most bullets are in the 190,000 to 200,000 RPM range. [URL unfurl="true"]https://www.accurateshooter.com/technical-articles/calculating-bullet-rpm-spin-rates-stability/[/URL] or [B]How to Calculate RPM - Calculating the RPM of a Moving Bullet[/B] [LIST] [*]Determine the muzzle velocity of the bullet. [*]Determine the twist rate imparted by the barrel. [*]Convert the muzzle velocity into the same unit per second as the unit of the twist rate. [*]Divide by the result by the length of the twist rate. [*]Multiply by 60. [/LIST] [/QUOTE]
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28 nosler, vapor trailing?
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