Thanks, all! Yes, I have shot both Pyro and BP. I tend to be on the side of Pyrodex for handling and storage reasons. Although, several years ago, I found a pound can of BP in the attic! Yikes, Still was good after at least 25 years. I didn't shoot it but put a match to it in reasonable sized piles because I was afraid to keep it around any longer. Lit RIGHT up! hahaha. Almost singed off the eyebrows on my friend who lit it! haw haw haw. We still laugh about that! That old trick you see in the movies where they pour a string of BP away from the "big blast" and light it really works, I can attest to that. That stuff burns in full Technicolor.
As far as cleaning, I take my repro pistols apart and wash the cyclinders in the sink under almost scalding water and a little soap. Dry, them. Then cook them in the oven for 15 minutes at LOW to remove all the water. Then hit them with WD-40 or RemOil and I'm done. This Hawken barrel will come off and I'm tempted to do the same with it, except the oven part.
Haven't fired a BP Rifle in over 30 years, so I'll let you know how the Hawken works!
Also, I ended up ordering supplies from Dixie cause I had trouble finding a BP store around here. I got .535" balls and .010" lubed patches. That other .005" might come into play but I hope not. Kurtz