Well, I suggest Federals with Sierra Gamekings. If a gun can' t shoot those, it has problems. You just going to have to play around. Keep that forearm screw tight. If it loosens, your POI will change alot.

Out of my 270 7400, I load 130gr Sierra Gamekings and 45gr of IMR4350 with Fed 210 primers and get 1.2" groups.

Don' t expect too much out of a 7400 as far as accuracy. Remember it is a semi.