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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long bullets require fast twist barrels?
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<blockquote data-quote="MontanaRifleman" data-source="post: 864521" data-attributes="member: 11717"><p>Sorry Michael, The calc that is on Bergers site is for the specific gravity of lead core bullets. That's why it's there. It makes no sense for them to provide a calc that is based on the specific gravity of copper monos. I've used that calc for the 6.5 140 CEB's. Another member, Outlaw 6.0, also use the calc and figured he could get the 140's to stabilize inhis 8.4 twist. He could not. If memory serves me right (and maybe he will chime in) the inputs were about a 3000' elevation, 40* and 3200 fps or more. The Sg the calc gives is 1.31 which although marginal, is enough to stabilize a bullet.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 864521, member: 11717"] Sorry Michael, The calc that is on Bergers site is for the specific gravity of lead core bullets. That's why it's there. It makes no sense for them to provide a calc that is based on the specific gravity of copper monos. I've used that calc for the 6.5 140 CEB's. Another member, Outlaw 6.0, also use the calc and figured he could get the 140's to stabilize inhis 8.4 twist. He could not. If memory serves me right (and maybe he will chime in) the inputs were about a 3000' elevation, 40* and 3200 fps or more. The Sg the calc gives is 1.31 which although marginal, is enough to stabilize a bullet. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long bullets require fast twist barrels?
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