I don't know. Really! I think it's a mistake to get all tangled up in group sizes at such and such a distance, and then declare you'll never take a hunting shot beyond that distance. When you see the spot you want to hit and then you procede to do it, no matter what the distance is, that's acceptable accuracy.

A couple of years ago, I shot a quail at somewhere around 80 yards with a good 25+ mph crosswind. (I thought it was a clump of grass though[:-]) I knew I could hit it and I took the shot. Then there are times I know I'd probably miss the bottom of a #2 washtub at 20 feet.[&o]

Some days you gots the mojo and some days you don't.