I dug through all of my old stuff and used my calipers to find a handfull of .520 balls. Using Walmart ticking, Birddog6 lube, 60 grains of Goex 3F, and Remington caps I shot several 3/4" groups at 25 yards. Loading was very easy and wiping between shots was unnecessary. When I finally did clean there was little residue in the bore.
If I could see I believe I could shoot this well at 50 yards. It was pouring rain and I had 2" of fast running water under the bench.