Re: wind call "rehab"
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ch'e</div><div class="ubbcode-body">some stuff i cut and pasted-sterlingshooter wrote the first part and cant remember who did the rest
I use a simple formula (range divided by 100 times half or full value wind in MPH divided by constant of 10). This yields an answer in MOA of drift. I can thereafter click or favor for a good hit. When favoring with irons, where converting MOA to inches may be useful, I can also easily convert to inches without need for a calculator. Of course, whether you need a fomula which gives you an answer in MOA or mils will be determined by what sort of sight you've got. One more thing, the constant of 10 is not exact science; but, for mid-range to LR, for most any standard high velocity bullet, it gets the job done. As far as how good I am, I expect good first round hits for myself as well as students.
(Range[hundreds] X wind velocity MPH) / Constant = Adjustment in MOA
Constants:
100-500m =15
600m =14
700-800m =13
900m =12
1000m =11
Environmental indicators can be grass, trees, flags, smoke, and my favorite for under ~8mph; mirage.
I use what was taught to me as the "British method." A reference of wind adjustments in mils for 10mph FV winds at 50 meter increments. Yes, I go by meters, so sue me.
Target at 500m= reference dictates 2.0mil adjustment at 10mph FV
Actual wind is 5 mph, half value
2.0mil x 0.5(actual wind speed) x 0.5 (wind value) = 0.5 mil hold
I shoot .308 175gr SMK, normally I hold for wind, but occasionally dial. The reference is derived from a ballistic calculator. This method has worked well for me thus far.
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Do you have the constants for mil holds?
