My rule is this: Using the same set up as I would be using in the woods i.e. shooting sticks, resting off the side of a tree, out of a tree stand, out of a box stand, shoot 3 shot groups and see if you can keep them inside of 3 inches. If you can, then you should be good to shoot at game at that distance. Once you throw in the excitement your groups will open up to 4 or 5 inches I would guess.