Goex FFFg (or 3Fg) is suited for Rifles (50-caliber and smaller), Pistols and Revolvers. While Goex has improved manufacturing processes and material quality, they have manufactured black powder using traditional materials to provide the same great ignition characteristics and uniform speed that master shooters and hunters have relied on for over 200 years. Goex Black Powder is available in different granular sizes to tailor performance to a specific firearm. From FFFFg (smallest) to Cannon (largest), Goex has a granulation size for your firearm.
Warnings from the Manufacturer:
Do not exceed the loads displayed in the reloaders guide.
Never mix any two powders regardless of type, brand, or source.
Never substitute any smokeless powder for Black Powder or any Black Powder substitute.