Nothing wrong with a 28 ga. bore, they will shoot a standard .530 ball real well. The barrel is on the large side so I would probably build an early gun with it, perhaps an early Dickert, or any of those early guns shown in RCA...take your
pick. Put sights on the barrel and shoot it just like a rifle, and, if the opportunity arises, you can also shoot shot out of
it. I have a friend that has killed turkeys with a 28 ga....................Don