I am having a problem and was wondering if any .22 prone shooters might be able to help my problem is i can set my diopter spot on the ball and put 2or 3 shots through the same hole then the whole group moves out to the left and i have to re ajust my diopter this is at 25yds useing r50 ammo i was just wondering if anyone else has ever had a problem like this my prone rifle is a Walther kk match with a Walther diopter sight.

Thanks for looking and good shooting.