Been a while since I have been on the forum......
I loaded some .45LC with a boat load of 777 3F.
My 5.5 inch barrel Ubertis and Ruger got red hot performance. Kicked like a mule. Pistol got hot quick.
Stopped shooting those rounds. Downloaded them in favor of a little lighter load.
Use the 777 in 45-70 Trapdoor, Rolling Block and Sharps with no problems.
I probly will avoid 777 3f in the future.