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The Basics, Starting Out
Twist rate = Grain
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<blockquote data-quote="Doom2" data-source="post: 2743753" data-attributes="member: 108323"><p>JBM also has a catalog of bullet lengths. Neither the Greenhill or Miller formula are accurate as they tend to overestimate the required twist. I believe Berger is using the Gyroscopic Stability equation for their estimate which is a more complex formulation.</p><p></p><p></p><p>The twist is a function of the overall length of the bullet. For a fixed bore diameter the weight increases the length for similar bullet geometry.</p></blockquote><p></p>
[QUOTE="Doom2, post: 2743753, member: 108323"] JBM also has a catalog of bullet lengths. Neither the Greenhill or Miller formula are accurate as they tend to overestimate the required twist. I believe Berger is using the Gyroscopic Stability equation for their estimate which is a more complex formulation. The twist is a function of the overall length of the bullet. For a fixed bore diameter the weight increases the length for similar bullet geometry. [/QUOTE]
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The Basics, Starting Out
Twist rate = Grain
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