Has anyone seen or heard of a BP or Pyrodex type powder (designed for BP guns), that you can shoot for over 1000 rounds without cleaning? I caught the tail end of a commercial the other night and could have sworn that I heard the announcer state that the BP guns didn't require cleaning if this powder was used? I like my BP and Pyrodex, but I wouldn't mind taking my time to clean the guns without fear of rust either...