[wterrell]

As a frame of reference, a yard is composed of 3 feet. These three feet are composed of 12 inches for each foot.
Now let's see, if I shoot 5 times at 20 yards, that's 100 yards. And the grouping should be somewhere in the grouping of 2 inches. (Surely, a couple of those shots will be within a couple inches of each other.)(Off-hand shooting, mind you.)
I find it incredible (I'm being polite) that a person can fire a short barreled pistol at a measured 100 yards and the greatest distance between any two of the 5 shots would measure 2.09 inches, centerline to centerline.