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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Twist
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<blockquote data-quote="Michael Eichele" data-source="post: 77980" data-attributes="member: 1007"><p>You were getting your idea of below 2800 FPS by the green hill formula. His formulas dictate differant twist needs for differant velocity. 1500-2799 uses 1 constant and 2800 and above uses nother constant in the formulas. The faster you drive a bullet the less twist is needed. Most modern calcs use a gradual increase or decrease instead of 1 FPS being the deciding factor.</p><p></p><p>The JBM website has a very usefull twist calculator as well as the RSI and Reloaders Archive computer programs.</p><p></p><p>I hope that helps your research.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 77980, member: 1007"] You were getting your idea of below 2800 FPS by the green hill formula. His formulas dictate differant twist needs for differant velocity. 1500-2799 uses 1 constant and 2800 and above uses nother constant in the formulas. The faster you drive a bullet the less twist is needed. Most modern calcs use a gradual increase or decrease instead of 1 FPS being the deciding factor. The JBM website has a very usefull twist calculator as well as the RSI and Reloaders Archive computer programs. I hope that helps your research. [/QUOTE]
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