I don't remember having any dirty shooting problems - might have as most powder I had was C&H, Meteor and the odd can of Dupont.
By '74, we had learned to use wet patches of heavy denim and our shooting dirty problems were long gone by the board.
I did shoot meteor as late as about 1978, iirc in my .58 S.Hawken that Taylor built. I used 140gr. 2f with patched round ball and up to 165gr. 2f with the 675gr. Minnie ball.
It kicked a bit. here's the light charge with round ball - likely 1977.
Pictures by the late, Lester H. Hawkes, my friend and mentor.