IDMilton - I tried Winchester, Remington-Peters, and Federal. Since I knew my handloads would do better, I abandoned the factory ammo after those three. BTW, those were 3 shot groups. Tikka says their rifles will shoot 5 shot groups an inch or under, right? Guaranteed! But as many others have pointed out, when you have one that doesn't, there's no procedure for getting another one from them. I'll stick with X-bolts and Vanguards, both of which are more accurate than Tikka's IME.