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From page 14 of the T/C Hawken owner's manual:FFG (commonly called Double “F”)This is a very popular powder for .45 caliber to .58 caliber rifles.It is also used for 12, 16, and 20 gauge muzzleloading shotguns.While it is not considered a pistol powder, it is sometimes used invery large caliber single shot pistols. It is recommended for usein most T/C muzzleloaders.FFFG (commonly called Triple “F”)Due to its wide range of uses, Triple “F” is the black powder thatis most commonly found on a dealer’s shelf. It is used in all percussionrevolvers, most single shot pistols, and most of thesmaller (under .45 caliber) rifles. In a pinch, it can also be usedto prime a flint lock.Nowhere in the 50cal Owners manual is a FFFG load advertised. Just FFG or equivalent.