I've owned 3 1:48 twist guns, all T/Cs. They have all shot great with Maxiballs (the 370s). Maxihunters shot OK, but not as good as Maxiballs. Buffalo bullets were OK too. One shot REALs acceptably. It may have been possible to improve accuracy with other bullets by varying the charge and testing things like felt wads, etc., but since the Maxiballs shot so well, I never really messed with it.

100 grains of Pyrodex and a 50 or 54 caliber Maxiball is a mean load for deer.