plentycoupe,
As far as keeping everything dry, get or make a WOOL case for the rifle, and carry it in that until you are setting up for the shot. Jim Baichtal does almost all his hunting here in Southeast with a muzzle loader and is extremely successful. He gave me that little bit of advice. He claimed that, even if the case is dripping, the rifle itself will stay dry. A plain, two layer case, open at the end which you fold over and tie to close the whole thing, made out of a wool blanket should do fine.
You have a little time before the hunt, so get out as much as you can with the piece in all weather, to see what works best for you. .54 round ball has kiled a lot of game. Whetever you are comfortable with shooting. Shot placement is the thing.
Carry three or four premeasured loads in small pill bottles. For round ball I would use a loading block, maybe a small pouch to carry greased maxiballs?
Sheesh, let us know how you do. I am envious!
-Winter Hawk-