I cut some C balls in half and installed some thread-all between the two halfs. The balls are 1 7/8 and I spaced the two halfs 4 inches apart, worked OK. After I cut the balls I drilled and tapped them for half inch endless thread with 4 inch spacing flat to flat.
We set up some targets made of construction scrap, 2X4's and half inch plywood, at 75 yards. Quite a show, the bar shot ripped some good holes in the target. I want to set up some rat lines and see what happens.
Bill