They are basically a plastic sabot that you out a roundball into. There are some people that have shot them and had pretty good results actually. I too intend to experiment with basically the same thing. I want to put a .58 caliber ball into a 20 gauge shotgun wad with an over the shot card on that. Then shoot that out of my smoothbore. I am hoping that it will act like a shotgun of sorts and give good accuracy to perhaps (could I be so lucky) 75 yards.