Tried my (Uberti) 1860's this weekend with 30 gr Pyrodex pellets, to see if and how well they work. It sure makes loading faster! I dropped in a pellet and a Wonder Wad in 5 then topped with a 454 ball. You can feel the pellet break when you run the rammer down. Remington #10's on Treso nipples lit them off without a problem. Fouling is not as heavy as BP, but the noise and smoke are equivalent. Ran several stages without the cylinders freezing up. The cylinder pins were coated with Bore Butter and the rest of the moving parts with Ballistol.
I had previously never been impressed with Pyrodex in a front loader, as it seemed like it didn't burn right. It works well in a cartridge, probably because the compression is better, Anyway, the pellet seems to burn better than loose powder.