From what i have read and the discussions on this subject. until late 1800's there was but one granulation of powder. best known today as FFG.
not true - just three references to various F grades pre-1800
THE SOUTH CAROLINA GAZETTE
September 25, 1736
Charleston, South Carolina
JUST imported in the King George, Jacob Ayres from London, white and colour'd plains, strip'd duffils, bullets, shot, F FF FFF gunpowder, Saxe Gotha hoop-petticoats,
THE SOUTH CAROLINA GAZETTE
June 11, 1741
Loaf Sugar, Gun Powder in half Barrels FF and FFF, Bullets, Strouds, Indian Trading Guns, Mens and Boys Felt Hats
The Pennsylvania Gazette
January 7, 1752
Imported (chiefly) in the Myrtilla, the last ship from London,
....best London steel, shot, F, FF, and FFF gunpowder....