Re: Muzzleloading Shotgun?
CVA and I believe Traditions sold single barrel percussion muzzleloading shotgun/kits that had interchangeable chokes. Such guns come up used on the on-line auctions about once every 6 to 8 weeks. CVA's might have been called the Trapper.
An original old double barrel can often be rehabilitated for less $ than a new kit. Building a single barrel is often cheaper to buy quality US parts than buy an imported kit gun.
An alternative is also to look on-line for a good used trade gun, (flint smooth bore.) Last I heard the Italian double barrel kits were over $500. I have a 24 ga trade gun that is very light weight and shoots either ball or shot. It is heck on small game.
Lastly, if you already have one of the Hawken clones, find an extra used barrel and have Bobby Hoyt in Fairfield PA ream it out to a shot barrel for you.
Lately there have been some lesser expensive muzzle loaders imported from India. Some are fair to good and some are crap. I bought a few locks directly from M. Sikligar in Udaipur (google it they have a web site and a face book page) I was impressed with how well finished the locks were. Indian muzzle loader double barrels were imported to the US back in the 1970's and I saw one last February at the Lancaster gun show. It wasn't finished all that nice, but the price was only $250
Dixon's near the krumsville exit of I-78, or Ft Chambers can get you fixed up.
some good information about muzzleloading shot guns at Circle Fly's web site.
Check Dixie Gun Works.