I have a big heavy .260 that is literally more accurate than I. If the groups open to a half inch for three , Its me . When I check the zero at 100 yds. I take a target and draw on it with a a pen to get the zero wanted for long range and dialing . I have had 5 shot groups that were an inch with three different sight settings to get my zero proper for distance work. Best group shot with the rifle in my hands was one day one the prairie in fairly calm steady conditions ,it held three shots , centered on target into 3.5" . Shoot while laying prone with bipod and good rear bag at 980 yds. I may not be able to repeat it, but the gun is capable. It is not surprising though because a lot of effort and care has went into this gun, And I baby it .