Here im shooting and loading a vest pocket derringer from traditions and another double barrel muzzle loader not sure what the other one is? https://www.youtube.com/watch?v=awjFxC_wBQw I would like one of these in .32 SW as well

Hey need some advice; I bought an American Derringer many years ago. Why I can't remember! I know most of the negatives about vs. a revolver but now I was trying to find a bullet or load that might actually expand in .38 special. It has .357 capability but it's a bear to shoot practice rounds. I...