I shoot musket caps, largely because I have poor circulation in my hands and it affects my dexterity. The musket caps are larger and easier to handle, for me at least. Might be an issue for others folks on cold days!
For powder, Triple-7 FFG, 110 grains.
For bullets, the Knight Bloodlines are disgustingly accurate out of either my Bighorn or Mountaineer. I shoot the 300 grain Bloodline, and it works fine on deer, and other folks have taken elk easily with that bullet.
Good luck to you!