So it turns out to be a good thing I didn't just try to shoot it. I took it to a gun smith who informed me that it was indeed double loaded. Ended up selling it to him for more than I paid for it. He has the ability to fix it, and now has a new gun, and I have more cash than I started with. Win, win.
Too bad I didn't see this earlier. I have an unloader that used CO2, and could have fixed you up in 5min or less.
Also could have taken you out and given you the rundown on black powder's messy awesome fun.