I was reading a story in the backwoods magazine about pumpkin ball loads. A shotgun shell that was designed to hold one round lead ball and used in smoothbore shotguns for big game hunting. This was used before they came out with slugs and rifled bore slugs. Well this got me to wandering if a person could empty a shotgun shell full of shot loads and replace them with say muzzleloading balls. Looking at my 20 guage shells it looks like two of my 50 cal. balls would fit right in. But I'm wondering what the effects it would have on my smoothbore shotgun(s). I could either put two round balls inside a shotgun shell or one round ball and one plastic wad inside. Now according to the magazine the pumpkin ball was only effective for up to 40 yards and was a great load for shooting through brush, so I'm thinking the muzzleloading balls would be something of the same. I've noticed after comparing the size of a 50 cal. ball to the muzzle of the shotgun there would be a lot of play as the ball would move down the muzzle. So I'm wondering if 58 cal. ball would be a better load, less wondering through the barrel. Anybody out there do any experimenting like this? How safe would it be? I'm not trying it unless someone else out there has done it or is doing it? Also, one reason why I'm interested in this procedure is if the SHTF and I need more arsenal to either gather wild game or protect my family.