Used right and with round ball or breakaway sabot in a seasoned barrel it works really good; with the type sabot most people are using know you are not supposed to lube so you can't have a seasoned barrel there for BB just don't fit the program. I have some guns in which I use it for all shooting like my 4 hawkens and my underhammerand the thunderhawk [uses breakaway sabots and my Rugar black powder But it has never touched my System One or Omega. Lee