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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
ballistic coefficient questions . 6.5 mm bullets
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<blockquote data-quote="Edd" data-source="post: 747454" data-attributes="member: 30592"><p>The Berger twist rate calculator shows that CE 130 gr bullet with an 8.4 twist starts dropping below the desired minimum 1.5 stability factor at an altitude of 3000 ft. </p><p></p><p>An 8 twist maintains 1.5 or above down to 300 ft and a 7.5 twist is 1.68 at sea level.</p></blockquote><p></p>
[QUOTE="Edd, post: 747454, member: 30592"] The Berger twist rate calculator shows that CE 130 gr bullet with an 8.4 twist starts dropping below the desired minimum 1.5 stability factor at an altitude of 3000 ft. An 8 twist maintains 1.5 or above down to 300 ft and a 7.5 twist is 1.68 at sea level. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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ballistic coefficient questions . 6.5 mm bullets
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