American Pioneer produces clean, dependable and powerful black powder substitute. Available in 2 different granulations, the FFg and FFFg, this powder substitute will work for patched round balls, sabot slugs or conical bullets. The FFg powder is used primarily in larger caliber rifles while the FFFg is used in smaller rifles and pistols.Specifications and Features: A popular powder substitute among cowboy action shooters, American Pioneer can be used in traditional black powder cartridges like the 45-70 Gov't and modern calibers like the 44 Magnum. It can also be stored in a flask, but only for a short amount of time. Returning the unused powder to the original bottle will keep it fresh for the next time.