I have a 500-yard range at my house. I had no trouble with sub-MOA with a 3x10 scope on my '06. OTOH, I had no trouble hitting within an inch or two of my intended spot on a buck with a 3x9 set on 3X, at about 350 yards.
Once you get "all married up" with a rig, "more" can be a bit helpful but it's rarely necessary.