Pyrodex P is intended to be a direct replacement for FFFg Black powder when measured volumetrically using a black powder measure. The principal uses for Pyrodex P are in muzzleloading pistols, cap and ball revolvers, and in small bore, muzzleloading rifles.
Pyrodex RS can be used in all calibers of percussion muzzleloading rifles and shotguns. It has a wide application of uses and is the most versatile powder in the Pyrodex line. Like all grades of Pyrodex, it burns cleaner and produces less fouling than blackpowder. RS compares to 2F blackpowder on a particle size basis.