The lower priced target ammo should give you some improvement, you will get fliers with those just not as many as the ammo you have been trying. Try a box or two of Center X or maybe some Eley Match to see if the rifle has potential, if it wont shoot accurately as you like with those or other similar ammo then you might need to have the barrel slugged to check for tight/loose spots before going any further, having the gun bedded,recrowned,headspaced,etc is a waste if the barrel is no good to start with. Another thing is we are talking about a mass produced hunting rifle not a bench gun. Good Luck with the rifle.