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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet RPM and performance
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<blockquote data-quote="jpndave" data-source="post: 2525734" data-attributes="member: 5437"><p>Yes, I am aware. Rotation = muzzle velocity * 720/twist. Wasn't trying to make a comprehensive post. The high RPM can come from twist, high muzzle velocity or usually a combination of the two. You can drive the lead core bullets faster (and it's done a lot). But the twist has to be lower to not over rotate the bullet.</p><p></p><p>For my rifles, both I am planning on ~ 3000 fps. So at 3000fps the 7-1/4 twist is pushing the 300,000 rpm limit @297,931rpm. If that same rifle gets a lightweight varmint bullet at say 3500fps it's over the edge by a bit @347,586rpm.</p></blockquote><p></p>
[QUOTE="jpndave, post: 2525734, member: 5437"] Yes, I am aware. Rotation = muzzle velocity * 720/twist. Wasn't trying to make a comprehensive post. The high RPM can come from twist, high muzzle velocity or usually a combination of the two. You can drive the lead core bullets faster (and it's done a lot). But the twist has to be lower to not over rotate the bullet. For my rifles, both I am planning on ~ 3000 fps. So at 3000fps the 7-1/4 twist is pushing the 300,000 rpm limit @297,931rpm. If that same rifle gets a lightweight varmint bullet at say 3500fps it's over the edge by a bit @347,586rpm. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet RPM and performance
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