Oh, the FFF rule for .45 and below and FF for .50 and above...This myth was developed in the 40s...The 1940s...

During the 1700s there were 2 desginations of powder, cannon and musket....

It's a myth that you can't use FFF in .50 calibers and above...I use 80grs of Goex FFF in my .54 and have for over 20 years...This way I can charge and prime with FFF instead of charging with FF and using FFFF for prime...

In addition...I'd have to bump my charge up to 90grs of FF to equal the velocity I'm getting with FFF...Less powder, less fouling...FFF also burns cleaner than FF, less fouling...