I just got my first Muzzleloading revolver today. It is an 1858 Remington New Army .44 Revolver. Can I use Pyrodex with this revolver? I noticed that on the side of the barrel, it says "Black Powder Only." However, I thought that either one could be used, and in the instruction pamphlet that came with the gun, it said that I could use either black powder or Pyrodex safely. It does not make much sense. Also, about how many grains of FFFG powder would it take? I am new to these revolvers, so any help and info. would be greatly appreciated. Also, Thanks.