I have been messing around with the shooting of black powder since around 1953 when I was buying DuPont BP in the small oval red metal cans. Up until yesterday, I never realized that in addition to 1FG through 4FG, we also have 1.5FG powder available. That's one and a half FG. This was seen on a certain website catalog. Wonder if there is actually much call for this particular grade of BP. I wouldn't think it'd make that much difference when using it to shoot cannon or mortars. Anyone here use 1.5FG grade??