Pyrodex works all right, but normally when I shoot Pyrodex I use the "P" grade powder in the inlines and the RS in the traditional rifles. I sometimes think inline rifles like a little faster burning powder then the old traditional rifles do. Although I have shot a lot of the 3f grade powders in the traditional rifles as well..

http://members.aol.com/noexcusesb/page2.html I've yet to try Dave's 495 grain conicals and they would probably be illegal for you because of your double the caliber rule, but the 460 grain .503 are real good projectieles and they come pre lubed...