If you are a reloader, then you will have some work to do if you want tighter groups. Each gun has a certain preference for ammo. If all you shoot is factory loads, then you should get several boxes of different factory ammo with different weight bullets, and try shooting groups with each. That could run into several hundreds of dollars, given the very large number of factory loads on the market today, but it's the only way to hopefully find the particular ammo your gun likes best. Mine shoots very well with the Winchester Supreme 260 gr Nosler partition. On a good day with a shooting glove and a 4x Leupold, I can get 3 shot 1.5" groups at 50 yards. The gun might be able to do better, but I can't. And since I limit my hunting shots to about 50-75 yards, that level of accuracy works for me. Good luck in your accurate ammo quest.....