I patterned this contraption yesterday at 15 yds. A dense even pattern that measured over 30" in diameter. I guess I figured out what its purpose was intended to be. Now if I could just find a way to prevent the side lever from digging into my hand when I fire the lightweight gun, it would make a nice light woodcock single shot gun!

Next, I may try to fire a sabot out of it and see how it shoots.