15-20...good guess. The wind blew it 13 inches at 400. But yeah this rifle is pretty consistent at 400. My focus point was bullseye. I didn't really care about the wind blowing my bullet away from bullseye. I was just looking for a group. But now I know with a 17 mph wind at 400 yards I have to hold 13 inches for wind.
Does not compute with 17 mph wind from 3. Not even at 3100 fps. It comes out at 20.4" at your given info.