There is absolutely nothing wrong with useing black powder in your black powder rifle, but by the same token there is nothing wrong with the load I gave you, it simply duplicates the black powder load in every way, pressure, velocity, and accuracy. The black powder you get today is not of the same quality as it was when that load engraved on your rifle was developed. It is almost impossible to get enough modern BP in a given case to dupe the origenal load. The fact is, to duplicate the actual old load, with black powder, one must do a duplex load, with a small amount of smokeless on the primer, and the remainder black powder. Of course in the single barrel rifle the use of all black powder will only give you a weak load, and since no regulation is needed, will simply just not shoot to the sights at the ranges they were cut for.

None of this is critical in a single barrel, but if you were shooting a double rifle, black powder simply would not regulate the rifle and either a duplex load, or a regulateing smokeless load would have to be used! Of the two choices, the Duplex load is far more dangerous, if you make a mistake, than the smokeless load useing dacron filler!

Have fun with you single shot, they were a very big part of the hunting field when they were made!