I always thought the test of a handguns accuracy was taking into account all the ammo it holds, and find your grouping for that. So if you have a 6 shot revolver, how close are all 6 shots, and if you have a 15 round 9mm how close are the 15 rounds. Maybe others will think it is dumb, but that is the method I measure from. I am not a great shot, so I just tell everyone I am cheap and like to be able to reuse my targets.

So I just measure the dents in the sandbank--yardstick works very well.