After reading the wonderful article about the Pauly shop in the last DGJ, I realized I had read nothing about any shot and wad units with combustible powder sections. I'm thinking about how the old Colt skin revolver cartridges worked where seating the bullet crushed and opened the powder section. Was anything similar ever tried for shotguns during the muzzleloading or early breechloading period? It is likely shot cartridges of this type would be too delicate to be of practical use.