I inherited a black powder percussion cap rifle from my Father In Law. It appears to be rather old and possibly a .38 Cal. The rifle has had a bad life and the first time I saw it was before my Father In Law passed so I've never know it to fire. It's pretty rusty and I'm pretty certain something is in the barrel but my ball puller won't bring it out. Somehow the cap nipple was damaged and is too rusty too remove, as is the well cap. I do not want to apply heat as I'm pretty sure it would turn in to a pipe bomb if there is active powder in there. The lock plate was pretty rusty and the springs were broke but after I cleaned it up alittle I noticed the word "Marranted" engraved on the plate. At first I thought it said Warranted but I'm pretty sure it's an M. There's also a pheasant and a deer engraved on the plate. I can't find this gun anywhere. The back half of the barrel is hexed and the front half is round. The tang and the barrel lock pin is broke off too. Any help identifying this gun?, or is it just junk and I shouldn't waste my time.