The rangemaster let me in on this and it helped me this year. My trigger is too heavy and with the way I gripped the gun (cheek to the stock, forefinger on the trigger, <u>thumb wrapped over the top of the stock</u>) was causing me too twist the gun very slightly when I squeezed the trigger. He told me to align my thumb with my trigger finger to keep from twisting the gun on the shot until I go to a gunsmith to adjust my trigger. My groups improved immediately.
Good luck everybody.