If you aren't reloading to get the benefit of really getting down to the nitty gritty of what the rifle wants, you may not get better groups than what you mentioned. How is the trigger on the rifle? That is one of the first things to look at besides the ammo because you can't have good groups with a lousy trigger than has a lot of pull, creep, and /or overtravel. I brought groups way down in my 03A3 just by putting a Timney in it and getting rid of the trigger the military used.