I suggest that bigfootbob get a roll of brown wrapping paper and a sheet of quarter inch plywood, Pin the paper to the plywood as a target. Then at 30ft 20ft 10ft 5ft fire a standard choked-for-duck 12ga shotgun loaded with number-6 shot and look at the patterns and penetrations on the target. I’ve seen it done. Quite impressive.
I am all for everyone being armed, but his lack of basic knowledge (while thinking he is smart) is scary.