Yup.
It's smooth-bore and it's a shotgun. The method of ignition is a never-mind. Single barrel percussion shotguns are often referred to as fowling-pieces, and the auction rooms are knee-deep in them [well, almost]. Make sure that you get one that is in proof and then get back to us. A few in my club shoot such old stagers.
On the other paw, you get something that has a bit more mana - a Brown Bess, for instance!
tac