Just load & shoot like any other ML , the only real difference will be in clean-up , all you will have to do is pull the barrel off the frame , pop out the breach plug and wash the barrel in warm / soapy water .
After shooting my H&R Huntsman ( basicly the same style ) I'm not sure I'd go back to a normal ML again .
stimpy
PS - normal Black Powder will be fine in either ffg or fffg .