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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
240 weatherby twist rate
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<blockquote data-quote="Edd" data-source="post: 743371" data-attributes="member: 30592"><p>78% more, not quite double.</p><p></p><p>Using the same Berger calculator.........</p><p></p><p>3300 fps in a 9" twist gives a stability factor of 1.24 </p><p>2900 fps in an 8" twist gives a stability factor of 1.50</p><p></p><p>A minimum of 1.5 is recommended. Seems there may be more to it than RPM. Perhaps higher velocity makes a bullet more unstable.</p></blockquote><p></p>
[QUOTE="Edd, post: 743371, member: 30592"] 78% more, not quite double. Using the same Berger calculator......... 3300 fps in a 9" twist gives a stability factor of 1.24 2900 fps in an 8" twist gives a stability factor of 1.50 A minimum of 1.5 is recommended. Seems there may be more to it than RPM. Perhaps higher velocity makes a bullet more unstable. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
240 weatherby twist rate
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