I have a number of boxes of these MiniShells for sale, 20 shells to a box, $15/ box. I have the slug version and the shot version (1B + 4B). Up front, they don't work well in a Mossberg because the front of the shell falls between the fingers that lift the shell from the magazine to the barrel. They are not recommended for semi-autos at all. I'll be in Portland over the weekend if you would like some. Feel free to try a box then come back for more if you like them. They are very cool if your shotgun can feed them reliably. My Mossberg 500 would fit 10 of them in the magazine, plus one in the chamber. Plenty of sources on the web if you want more info.