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Long Range Hunting & Shooting
Effects of cross wind on elevation
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<blockquote data-quote="Jim See" data-source="post: 1561537" data-attributes="member: 69519"><p>In my training classes 5 years ago we started shooting targets east and west with a south wind at 1000 yards on a range from a single firing position. Minus the effect of Coriolis on the elevation we came up with a solution for the cartridges we use in prs. (6mm and 6.5 with 7.5 to 8.5 twist barells, 9-10 twist 308) The general rule of thumb I discovered and use is; for every Mil of wind I hold or dial, change the elevation solution 10%. So right to left wind holding 3 mils of wind, lower elevation .3 mils. It does not matter the distance or wind speed just adjust according to the wind correction needed. This is not perfect but it typically keeps you on a 1-2 moa target every time. Aero jump is what takes place as the bullet leaves the muzzle in a crosswind (by theory) and Magnus effect is the accumulation of an elevation change as a bullet travels down range. (basically Bernoulli effect, in that it is continual lift)</p></blockquote><p></p>
[QUOTE="Jim See, post: 1561537, member: 69519"] In my training classes 5 years ago we started shooting targets east and west with a south wind at 1000 yards on a range from a single firing position. Minus the effect of Coriolis on the elevation we came up with a solution for the cartridges we use in prs. (6mm and 6.5 with 7.5 to 8.5 twist barells, 9-10 twist 308) The general rule of thumb I discovered and use is; for every Mil of wind I hold or dial, change the elevation solution 10%. So right to left wind holding 3 mils of wind, lower elevation .3 mils. It does not matter the distance or wind speed just adjust according to the wind correction needed. This is not perfect but it typically keeps you on a 1-2 moa target every time. Aero jump is what takes place as the bullet leaves the muzzle in a crosswind (by theory) and Magnus effect is the accumulation of an elevation change as a bullet travels down range. (basically Bernoulli effect, in that it is continual lift) [/QUOTE]
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Effects of cross wind on elevation
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