There is a replica made on the Wessen pattern - might be a Pedersoli - and might not be made any more. There are 2 fellows who attend the Helfey Creek Rendezvous (BC) who own and shoot these rifles, in .45 cal. I think.

The Wesson was a late period target rifle (obvious by the dates) for the most part and the muzzle was usually turned for a guide bullet starter. The barrel might have been made in Wesson's shop, or could have used a Reminton barrel, as Reminton made those 'muzzle-turned barrels for the rifle parts trade.

I saw a picture of one years ago, with a Swiss-style heavily hooked butt plate for offhand shooting.