I have one but don't really shoot it that much as I'm not much into muzzle loaders, it's just my favorite of them. TC makes a peep for it you should be able to get thru them or any TC dealer. Check Ed's TC's a GBO Sponsor, his banner is on the TC Handgun Forum.
I use 100 grains equivalent of Pyrodex Select in mine under Hornady Great Plains bullets or Buffalo Bullets. I think they weight about 365 to 370 grains as best as I recall. That's all I ever use in mine.