Ok, so some probably know and/or use the wind correction formula that (I think) uses the 1st digit of the BC
What seems to "work" (or at least line up with my ballistic calculators) is this
[Wind (mph) / BC# ] x [Range/1000] = mil # wind correction
Out to 500 yd, this is "minute of steel plate", effective to get on target
Past 500, you add .1 to the distance portion.
Using 3 as my 5.56 (77gr smk) number and 4 as my 308 (175gr smk) number, the math works out to within .1 mil or so (close enough for hits on plates)
308 example: 8mph full value wind @ 500 yards
[ 8/4 ] x [ 500/1000 ] = 1.0 mil correction
eg.
videoQuestion:
Does anyone know the math behind this? Who/how was this formula derived?