Re: Looking for Information on Muzzle Loader
Many rifles of that era had barrels made by Remington, Ilion, New York. You might look to see if that fits anything you can see.
FWIW, that stock has been refinished and the screws holding the patch box may not be original. Most patchbox screws and screws of any kind at that time were iron; modern "restorers" think brass looks better and replace the old (and possibly rusty) iron screws with brass.