TedH,
I've used Pyrodex in a Model 94 30-30. I used a very compressed load to promote uniform, clean burning. After about ten shots, I had to clean the bore so the cartridges would chamber due to fouling in the throat. But my accuracy and uniformity were excellent! I used Lyman 31141 cast bullets.
As for clean up, yes it took quite a bit of cleaning to get the bore spotless! I didn't find that any fouling got into the action. However my cases turned black as coal! If you do this experiment, be sure to take along a jug of vinegar and water that you can drop your cases into after firing. (I learned that trick afterwards!<!--emo&

--><img src="http://beartoothbullets.com/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='

'><!--endemo--> If you want a smokeless powder that duplicates BP performance, try 5744. You use smaller charges, but the velocity/pressure ratio is similar to BP. I've had superb results with it. Let us know what you decide to do! IDShooter