Superfine powder difference?

[Okie Hog]

Used in a .50 caliber rifle with patched round ball; 100 measured grains of 3F black powder is about 100 fps faster than 100 measured grains of 2F.

 

[#BPBReloadingFFL]

Hummm maybe just maybe "Superfine" means really nice powders.
Like super cool super great superman not super small