An average shooter couldn't shoot consistant 2" groups at 100 yds.
I spend half my range time explaining how to sight in, why the gun shoots higher off a piece of 2X4 than a sandbag, why you shouldn't yank the trigger, etc.
Last time I was out, the guy next to me would fire a round from his new 30/06, remove the bolt, bore sight on the target, adjust the crosshairs and repeat. I asked him why he was doing that. His explanation was so absurd I didn't even try to argue.
Also, if you took the average shooter to a 600 yd range and showed him the target, he'd swear it was a half mile away.