Cast bullets are a natural in the .32/40 and the orig. loading was a 165gr. flat point lead bullet, loaded with Black Powder, Winchester still makes brass for this one, you can make them from 30/30 but they come up a bit short, my best load with smokeless was with IMR 4759(a reduced charge). In most lever guns the bullet must be seated deep for functioning and that is not always condusive to good groups. Breach seating bullets in a single shot is were the accuracy really comes out. You can also use trail boss although the vel. is low, 4227,RL-7. Bullets avail. from MT Chambers Supply.