A little off topic but I remember coming off the 1000 yard line at camp Grayling Mi. with 18 minutes of left windage on my rear sight. [iron sights, 45-90 black powder ctg. 535 grain bullet] 18 minutes is 15 feet at 1000 yds. Yeah, it was windy.That is some impressive shooting.
7 to 10 mph wind will drift bullet 55 to 75 inches appx at that long range shot he definitely called the wind well