http://muzzleloading-bullets.com/ind...es/Page319.htm
http://bullshop.gunloads.com/tbs_mlbullets.htm
Of the 2 above I prefer Bullshops because Dan sizes the bullets to your specs. Anywhere form .500 up to .5045 in the .50. His prices are also better than the NE bullets. If you order from Dan ask for pure lead and #2 lube. You will have to slug your barrel before you order.
I use a unlubed felt wad over the powder because I get better accuracy. The same is true with lower powder charges. Accuracy falls off when I use more than 80grs of powder and it seems to be at its best at around 65-70grs.