I'd be more concerned about the loose stock than the loose barrels. However, assuming it's a 12 gauge you can't really go wrong shooting Winchester AA Low Recoil/Noise loads through it. They generate about 6,000psi chamber pressure, have a very light recoil and are usually what I'll start an old gun out with.
Steve
PS It's gotta be a beer can (LOL), see if you can get one from a friend of another denomination.
Great info! It is a 12 gauge, so I'll look for some of that ammo. I wonder if there is a recipe online for a load that light? Powder is almost impossible to find in my area right now, but I've got about a dozen different brands in stock. Maybe I can find something really light and give it a try.
