Once I had the idea to stuff some steel screen down into some .44 CCI shot capsules, fill them with shot (#6?) then stitch the top together with some very thin wire. The idea was to make the shot hold together until it broke through the screen so it would pattern better. They were very time consuming to construct.

I didn't load the .44 shot cartridges very heavy. As I recall, I used 3 grains of Bulleye.

I propped a 3/4" piece of plywood against the garage wall, then backed off the distance of the garage and "patterned" my shot capsule on the piece of plywood.

It didn't pattern. But I found that a bean bag of #6 shot would blow a half dollar sized hole through both a 3/4" piece of plywood and one side of the wall behind it.

They sucked as shot cartridges, but it appeared that they would be a hell of a defense load,...even when only propelled by 3 grains of Bullseye.