I shoot pyrodex. But arent there a couple different types of LOOSE powder they make? I just have FFG. What are the other types of loose they have?

You can also use Pyrodex RS - Rifle/Shotgun Powder

Here you go:

Black powder is made of potassium nitrate (saltpeter), sulfur and charcoal. When ignited, it causes a dense cloud of white smoke. It comes in four sizes or granulations:
[ul][*]Fg: Coarse grain typically used in cannons, rifles larger than .75 caliber and 10-gauge shotguns or larger[*]FFg: Medium grain typically used in larger rifles between .50 and .75 caliber, 20-gauge to 12-gauge shotguns and pistols larger than .50 caliber[*]FFFg: Fine grain typically used in smaller rifles and pistols under .50 caliber and smaller shotguns[*]FFFFg: Extra-fine grain typically used as a priming powder in flintlocks
[/ul]
Pyrodex® and Clear Shot are black powder substitutes that can be used in amounts equal to black powder, but loading may vary. Be sure to consult instructions from a qualified gunsmith for loading procedures. Substitutes are not recommended for use in flintlocks because they may not ignite from sparks as easily.

Besides the Pyro R/S, they have a double-screened Pyro Select. Both are FF. Pyrodex also sells Pyro P... pistol powder in FFF. That one was always my favorite Pyrodex before I switched brands. You can use (P) in any rifle or pistola. It's slightly cleaner, slightly more powerful & slightly less corrosive that the other Pyros.

I just want to know the difference between the RS and regular FFG.