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Hunting
Long Range Hunting & Shooting
Effect of Bullet Spin on Terminal Performance
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<blockquote data-quote="mwkelso" data-source="post: 1695144" data-attributes="member: 110880"><p>This calculation is assuming a 1:12" twist...</p><p>For quite a while I could not figure out where "720" came from. Turns out it's simply 12*60, or 12 bullet rotations per 60 seconds for a twist velocity in rpm. </p><p>Here is an article from accurateshooter.com that breaks down the theory behind twist velocity, and also goes a little deeper into the calcs behind it. </p><p><a href="https://www.accurateshooter.com/technical-articles/calculating-bullet-rpm-spin-rates-stability/" target="_blank">https://www.accurateshooter.com/technical-articles/calculating-bullet-rpm-spin-rates-stability/</a></p><p>To the OP:</p><p>If your looking for optimal spin, you might consider looking at either Greenhill's or Miller's optimization equations. They have helped settle a lot of the controversy for me anyway. Not to disregard any of the above comments and suggestions. There is definitely a lot of wisdom in there, far beyond what I have in experience.</p></blockquote><p></p>
[QUOTE="mwkelso, post: 1695144, member: 110880"] This calculation is assuming a 1:12” twist... For quite a while I could not figure out where “720” came from. Turns out it’s simply 12*60, or 12 bullet rotations per 60 seconds for a twist velocity in rpm. Here is an article from accurateshooter.com that breaks down the theory behind twist velocity, and also goes a little deeper into the calcs behind it. [URL]https://www.accurateshooter.com/technical-articles/calculating-bullet-rpm-spin-rates-stability/[/URL] To the OP: If your looking for optimal spin, you might consider looking at either Greenhill’s or Miller’s optimization equations. They have helped settle a lot of the controversy for me anyway. Not to disregard any of the above comments and suggestions. There is definitely a lot of wisdom in there, far beyond what I have in experience. [/QUOTE]
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Effect of Bullet Spin on Terminal Performance
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