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Reloading Berger Bullets


Mixed Cases

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Unread 05-07-2006, 05:44 AM
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Join Date: Dec 2005
Posts: 2,483
Re: Mixed Cases

DocEd, a 20 fps change in muzzle velocity won't change vertical group impact at 300 yards very much. For example, 6mm 70-gr. HP boattail bullets leaving at 3240 average fps will center about 1/4th inch lower than if they averaged 3260 fps. The two groups would probably overlap quite a bit, too. It would take a rifle-ammo-shooter system capable of producing no worse than 1/8th MOA (3/8ths inch) groups at 300 yards to quickly and easily see the difference.

Consult some ballistics tables to see what a 20 fps change in muzzle velocity will do to vertical group centering for different bullets leaving at different speeds.
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Unread 05-07-2006, 11:34 AM
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Join Date: Nov 2005
Location: Maryland
Posts: 1,042
Re: Mixed Cases

Now I REALLY understand you. Thanks, DocEd
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