Goex FFFG, and if I can't get that, Goex FFG.
I much prefer real black powder.
Some black powder substitutes boast that their fouling is cleaned with only water. Well, lah-de-dah -- black powder fouling is cleaned with soapy water so what's the diff?
Both require the same cleaning method.
Black powder is harder to find, but in my experience it beats all others for accuracy.
Hodgdon 777 is powerful stuff. It is not designed to be used in the same amounts as black powder.
Back in 2004 I picked up a can of Hodgdon 777 and loaded it into my Uberti-made Remington 1858 in .44 caliber. I used a full load -- 40 gr. measure under a .454 inch ball. No greased wad between the two, and CVA Grease Patch over the ball.
Wowie! Zowie! That pistol bucked and roared! I knew after I'd emptied it that I'd just fired some powerful loads.
Then I looked at the label and noticed that Hodgdon recommended 35 grains in the Ruger Old Army! Yikes! The Ruger Old Army is the strongest cap and ball revolver ever made.
Hodgdon recommends something like 30 to 35 grains in the steel-framed Remington. I don't use 777 much, but when I do I set my measure to 30 grains.
Yeah, it was a stoopid thing to do.
I like black powder. It works, it's the propellant for which these revolvers were designed, and there's no questioin as to how much to use.