I had the exact same issue with mine and it turned out I needed to do a new load. Factory Hornady 140g ELDM shot 1/4 MOA for the first 3 boxes then opened up . I did everything I could think of; removed bipod, back to factory break, cleaned the thing spotless and had it inspected by GS to ensure clean and ok. Only when I stretched the bullet (140 g ELDM) out to 2.380 overall leangth to ogive did my group come back. 42 g H4350 , Hornady brass with Fed Gold Match Lrg. Magnum rifle primers. I use mag primers because I have a 270WSM for hunting and don’t want to stock two primers. Your not alone !