Pete,
Re calibre, for good hunting results and ease of carry, I'd say a .54 at any rate. (Bigger hole, lighter barrel)
Rifle style I can't say, as I'm no expert of Mass. guns.
I Do know that rifles were sometimes traded for work, such as clearing land, and a young lad from Mass. Could have been employed clearing land/splitting rails in PA.....
I suppose you can make your scenario whatever you wish to fit your choice, but the Chambers I Haines kit is one of the best, and would make a V nice, not too long or heavy, rifle.
Just don't get it tarted up too much!....bit carving, yes, (not too much) and no metal inlays besides furniture. :-)