I used to load for the old top break .38 S&W revolvers, and I agree the hollow base wadcutter is a great choice. The base expands to fill the grooves and the flat bullet makes a respectable hole. IF I were to load a .38 S&W round for carry - in a newer revolver - I would use the HBWC and around 4.5 grains of Unique...but I'd work up to that from 4 grains. They are very well made little guns, and I have enjoyed occasionally shooting them for decades now.
I often wondered, given the machining and workmanship on these little guys, what they would cost today, if made to the same quality...