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Rifles, Reloading, Optics, Equipment
Reloading
105gr berger VLD
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<blockquote data-quote="LouBoyd" data-source="post: 587046" data-attributes="member: 9253"><p>Greenhill's equation is useful as a quick check, but what is missing in the equation is the effect of air density. Higher temperature, higher altitude, and higher humidity all reduce air density. Bullets are least stable in a cold dry high pressure atmosphere. </p><p> </p><p>Berger recommends an 8" twist for their 105 grain VLD hunting bullets. I live and shoot in Arizona at over a mile elevation. I have pre-64 243 Win 70 with a 10" twist which shoots them very well. Despite that I chose an 8" twist for my most recent LR-243 build to be sure it will work in cold and low elevation conditions too.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 587046, member: 9253"] Greenhill's equation is useful as a quick check, but what is missing in the equation is the effect of air density. Higher temperature, higher altitude, and higher humidity all reduce air density. Bullets are least stable in a cold dry high pressure atmosphere. Berger recommends an 8" twist for their 105 grain VLD hunting bullets. I live and shoot in Arizona at over a mile elevation. I have pre-64 243 Win 70 with a 10" twist which shoots them very well. Despite that I chose an 8" twist for my most recent LR-243 build to be sure it will work in cold and low elevation conditions too. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
105gr berger VLD
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