What kind of rifle are we talking about? If its a flintlock, then you shoot only black powder. Its the nature of the beast. If it is a cap lock traditional rifle, I have shot pinnacle 3f with really good results. It seems to have good power, it went off when I pulled the trigger, and was very easy to clean.

I recommend the 3f over the 2f because of the size of the grains. The 2f is so large it hardly pours through the funnel on the powder measure. Also the 3f is a nice clean burning powder.