Cautionary words!
: The need to pull the barrel and check for inlet barrel loops, wedge slots, etc, is paramount. On a thin round barrel, they should be soldered, or barely slightly inlet and soldered or brazed, but low temp silver is best. This is especially important near the breech.
: If the breeching was done by track, it should be right, but pulling the plug and checking plug thread depth against barrel threaded depth will tell a tale on how carefully/correctly it was done. Many people/companies/mfgr's/distributors think minor gaps are A/OK - they aren't and shouldn't be there as they are traps for fouling to rot the barrel.
: I think a Bess carbine, if done tastefully, would be a very desirable gun to have for hunting. The 12 bore ball is a splendid moose/elk killer to as far as accuracy permits consistant boiler room hits.
: Suggested loads run 3 3/4 to 5 drams, same as the original large bored guns, singles and doubles used for hunting. VERY popular in India & Africa, they were.