My original comment remains, dont compress 777 it makes is burn even faster.
I have some further investigating to do regading use of filler. Hodgdons suggest a wonderwad under the ball is all. I like the ball at the front of my revolver cylinder so fill it out, but this is against the recomendations.
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane