It really depends on the gun what it will shoot accurately, first buy you several different bullets, if you got the money two or three powder types brands, then start shooting start with 90- 100 grains of powder an work your way up to 150 an see where your accuracy starts to fall off an then I would use 10grs. less than that an that should work well. Personally I use the 185gr. bullet in all my muzzle loaders you get more velocity an better trajectory an it holds alot of energy down range because of the higher velocity but thats just what I like an my guns shoot that load pretty good.