ORIGINAL: metaldonnieg
It's RS, I actually don't believe I knew that there were different kinds.
How often do you put the wire brush to yours, if at all? I have yet to. Thought I might when I run out of this bottle of Pyrodex. I think I'll try to find some of that P next.
Pyrodex P is the 3f grain size while the RS is the 2f grain size. So if you get some Pyrodex P you might want to drop your load about 10 grains to see how it acts.