Don, I assume that Jones' work allows for the rare, but existing, shotgun barrel that shoots a pattern with a void in the center every time? These do exist. I have seen one with my own eyes. My first cousin's husband bought a brand new Browning B2000 many years ago, and I promptly began to smoke him on the dove field every time. He was normally a very good shot, and we figured the gun just didn't suit him. That is, until we patterned it and saw the classic doughnut pattern ............every shot. He had the choke recut at a gunsmith in Augusta, GA and the problem went away. He once again became my nemesis on the bird field.

SRH

May God bless America and those who defend her.