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Rifles, Reloading, Optics, Equipment
Reloading
Mixed Cases
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<blockquote data-quote="Bart B" data-source="post: 108670" data-attributes="member: 5302"><p>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.</p><p></p><p>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.</p></blockquote><p></p>
[QUOTE="Bart B, post: 108670, member: 5302"] 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. [/QUOTE]
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