I'll stick to balls in the "cap and balls" I guess. Everything I've read so far say's they're more accurate, plus, if they raise the point of impact, my walker will be shooting a foot high. I have some more shooting to do, but so far I'm considering notching the hammer more.
I use .457 ball in the Dragoon and Walker, but will most likely switch to .454. The last batch I cast in .457 load too hard since I melted some old birdshot in the mix. I'll stick to pure lead from now on and .454 as long as they still shave a little lead.