Well, if we are talking using iron sights only, I might be able to keep most of my shots on a 12" paper plate. Might even be able to do it on an 8" paper plate if I use a receiver (peep) sight. I'm too damned near sighted to see the sights properly and where I have straight glasses or the variable bifocals, I can't see the sights worth smelly stuff.
However, if we are talking using a scope, I should be able to keep all my shots on the 8" plate in the offhand position without too much difficulty and the wind ain't blowin' my fat carcass around.
from a sitting position, all my shots should be in the plate in a reasonable sized group to at least 300 plus yards, and all will be in a 12" plate at 500 meters. Note that an 8" plate is about the size of the kill zone on the average Mule Deer and the 12" plate on an average sized bull elk. I practice the offhand position at 100 yards and from the stting position from 200 yards to 500 meters. As I get closer to hunting season, I do this twice a week. Pays off out in the field.
Paul B.