Its always smart to buy the biggest POS that you can to put on a rifle that has to hit something about to hit you, or bite you, or a game animal that you want to eat. Why just a few months a go I watched a dude spend several hours sighting in his AR at 15 yards with some high quality $100 optic. I bet he fired several hundred rounds at the target. He ran out of ammo and did not get it sighted in, I was thinking, there goes the top Mensa member here in Alabama, spending the difference in ammo just so's he could buy a cheap scope.