I personally would not monkey around with BlackHorn 209 in a traditional rifle. They just plain are not made for it. Now granted Mountain Devil ignored all manufacturer's recommendations for load and went ahead and duplex loaded his rifle to get BlackHorn to ignite. But it you have to go through all of that ... what's the advantage.

Should a problem happen, you have no one to blame when you disregard the manufacturer's recommendations. Also your going into some uncharted territory there when you monkey with BlackHorn. Due yourself a favor, stick with Pyrodex RS. Its a dirty powder. So what. You have to clean the rifle anyway. You give the rifle a water bath and in no time have it all ship shape. Also, that powder will work in your rifle. There is no experimentation.