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The Basics, Starting Out
Wind Drift formula
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<blockquote data-quote="Greyfox" data-source="post: 1674114" data-attributes="member: 10291"><p>The situation where I find wind corrections most intense is in PRS competition. The method I use which is fast and easy with my MIL based scopes is to calculate the full value wind speed that produces a 1MIL wind correction(w/o spindrift) at 1000 yards. Correction for other ranges are simply in tenths of a MIL. For example for my 6.5x47 the wind speed for a 1MIL correction at 1000 yards is 6MPH. At 400 yards the 6MPH wind correction would be .4MILS. at 900 yards it would be .9MILS, etc, etc. A correction for angular wind direction can be easily accounted for. If that 400 yard dope was for a 12 MPH wind at half value, multiply the .4MIL correction by 2(.8MIL)for the 12MPH wind, then divide by 2 for the half value(.4MIL)....in this case the wind correction would still be .4MILS. </p><p>The wind speed for a 1MIL calibration at 1000 yards for my 6.5x284 with its higher ballistic performance is 10MPH.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1674114, member: 10291"] The situation where I find wind corrections most intense is in PRS competition. The method I use which is fast and easy with my MIL based scopes is to calculate the full value wind speed that produces a 1MIL wind correction(w/o spindrift) at 1000 yards. Correction for other ranges are simply in tenths of a MIL. For example for my 6.5x47 the wind speed for a 1MIL correction at 1000 yards is 6MPH. At 400 yards the 6MPH wind correction would be .4MILS. at 900 yards it would be .9MILS, etc, etc. A correction for angular wind direction can be easily accounted for. If that 400 yard dope was for a 12 MPH wind at half value, multiply the .4MIL correction by 2(.8MIL)for the 12MPH wind, then divide by 2 for the half value(.4MIL)....in this case the wind correction would still be .4MILS. The wind speed for a 1MIL calibration at 1000 yards for my 6.5x284 with its higher ballistic performance is 10MPH. [/QUOTE]
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Wind Drift formula
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