I shoot 3 shot groups on my pencil barrel AR cause its chrome lined and not a target gun. It'll do 1.5 or so MOA whether at 100 or at 400 and it generally hits what I aim at. Which brings up the important part, killing what you need to kill in spite of it not being a 1/4 MOA gun.

My mountain rifles though I shoot 5 as well as my Noveske light weight. That's good enough for me.