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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Wind Drift; First Third vs. Last Third of Target Range
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<blockquote data-quote="Bart B" data-source="post: 1125383" data-attributes="member: 5302"><p>Well then, I erred a bit. I don't know if Sierra nor any bullet maker tracked wind drift for sporting rifles. Some military projectiles have been tracked by radar to get their muzzle velocity for use in computers calculating where to aim them.</p><p></p><p>I made my own formulas based on the old military one (range in hundreds times wind speed divided by 10 (a constant) equals full wind correction value in MOA for winds at 9 and 3, use half the MOA value for winds from 1, 2, 4, 5, 7, 8, 10 and 11 o'clock). Used Sierra's software to get my own constants for each range as the military one only got you on the 6-foot square target paper through 1000 yards. My own constants were pretty accurate; within a couple MOA anyway based on actual wind speeds measured at different ranges.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1125383, member: 5302"] Well then, I erred a bit. I don't know if Sierra nor any bullet maker tracked wind drift for sporting rifles. Some military projectiles have been tracked by radar to get their muzzle velocity for use in computers calculating where to aim them. I made my own formulas based on the old military one (range in hundreds times wind speed divided by 10 (a constant) equals full wind correction value in MOA for winds at 9 and 3, use half the MOA value for winds from 1, 2, 4, 5, 7, 8, 10 and 11 o'clock). Used Sierra's software to get my own constants for each range as the military one only got you on the 6-foot square target paper through 1000 yards. My own constants were pretty accurate; within a couple MOA anyway based on actual wind speeds measured at different ranges. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Wind Drift; First Third vs. Last Third of Target Range
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