I sight in off sandbags then shoot off my knee sitting in my turkey chair. More often than not I have to do "minor" adjustments. Also, I found out that when I sight in at 16yds with Federal low brass 7/8oz #7.5 shot 1210fps in my 20 gauges my 3" turkey loads hit spot on at 40yds. That's with 21" and 22" barrels.