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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Twist Rate Stability Calculator (need help)
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<blockquote data-quote="Hugnot" data-source="post: 2024054" data-attributes="member: 115658"><p>The JBM stability estimator matches my Miller stability estimator that has been modified for plastic tipped bullets. The JBM estimator allows entry of plastic tip lengths. The Miller calculations are only estimates of expected stability. The Berger calculations are similar. I successfully modified the Miller calculation to work off-line using the Open Office spread sheet, it provides identical results as the JBM.</p><p></p><p>Apparently, Hornady uses their 4DOF calculations to derive optimum twist rates. A description of the method is provided on the Hornady site (better them than me).</p><p></p><p>Two different methods. Search for a copy of the Miller EXCEL calculation on-line then see how it works on EXCEL. Get into the Hornady site with its method description. </p><p></p><p>I use the Miller and Hornady methods before buying bullets or getting new rifle barrels.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2024054, member: 115658"] The JBM stability estimator matches my Miller stability estimator that has been modified for plastic tipped bullets. The JBM estimator allows entry of plastic tip lengths. The Miller calculations are only estimates of expected stability. The Berger calculations are similar. I successfully modified the Miller calculation to work off-line using the Open Office spread sheet, it provides identical results as the JBM. Apparently, Hornady uses their 4DOF calculations to derive optimum twist rates. A description of the method is provided on the Hornady site (better them than me). Two different methods. Search for a copy of the Miller EXCEL calculation on-line then see how it works on EXCEL. Get into the Hornady site with its method description. I use the Miller and Hornady methods before buying bullets or getting new rifle barrels. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Berger Twist Rate Stability Calculator (need help)
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