These wind formulas are from Todd Hodnett and work pretty good for in the field on the fly calculation in your head and go straight to mils *Move decimal point forward 2 places for range* * for calibers larger than 308 use 5 mph constant instead of 4 mph constant* Example: Range: 500 meters= .5 mils (*/4 mph) Wind value: 8mph= 8/4=2 .5 x 2=1 mil hold into the wind
Wind value: 12 mph( 12/4=3) .5 x 3= 1.5 mils into the wind
Range: 300 meters= .3 mils (*/4 mph) Wind value: 8mph (8/4=2) .3 x 2=.6 mil hold into the wind
That works for ranges up to 700 meters. For Ranges of 700 meters and beyond add .1 to range constant
Here is a link to the wind speed chart