Mark,
It's not a muzzleloading shop but still a place of interest. Check out Nawbin, it is basicly a bead shop but it is run by a colonial reenactor and a couple of the staff are also reenactors, real nice people. It is right on 8th street. If KArl or Tanya are there tell them I said "Hi".
Nick
ps. If you are just into looking over some nice looking guns check out Fieldsport. It is a nice little shop that deals in Doubles (both shotguns and rifles), it is across from the new mall.