Find a piece of brass rod just barely undersized of your chokes and about four inches long. Round the sharp edges off. Drop it into the muzzle, holding the muzzles upright, and it will dislodge stuck hulls and/or wads from the chamber and bore.
They're sold as "wad knockers" and double as a handle for a chamber brush, with a knurled area for grip. They're harmless to the bore and chamber. The only time the wad knocker will fail to eject a stuck hull is in the case of the shell rim getting under the ejector blade. Not even a ramrod will get that out, but it must be carefully pried from under the ejector without harming the ejector/extractor itself. That's an admittedly rare occurrence but it happens.
