I once bought a 20 ga side by side from Century Arms, for about $40 bucks, in the early 1970's. It was deadly on woodcock, but there was an awful lot of stuff to lug around to load with. I ended up selling that one, and later got a CVA 12 ga, also side by side. This one was unreliable--the locks would stop working after a while, and you'd have to dismantle the gun, bend parts around until the triggers activated the locks again, and then you were OK until the next failure. That one got sold as well. I've never tried the single shot TC's but they're doubtlessly much better. Still, it's an awful lot of stuff to lug around. It can be fun, though, upland hunting on a pleasant fall day when you're not in a hurry. I downed quite a few game birds with the 20--but remember, when you shoot, those smouldering wads go somewhere, and usually land on dried leaves. Watch out you don't start any forest fires.
Along these lines, how about getting a new (or used) Baikal side-by, and some of those brass shotshells. Get some of the correct wads, and load these shells with a black-powder substitute. That might be fun--and why I said Baikal is because they come cheap enough that you won't mind getting them crudded up with black powder (or sub) residue. I probably wouldn't want to try this with a fine foreign shotgun that cost more than the car that I drive. Right now, as I'm typing, I'm actually considering this idea for next fall. I've got the guns, powder, and shot. The next thing would be the shells and wads, and how to load them. Just a thought.....