YESS,
ORIGINAL: roundball
Black Powder can certainly be weighed but I guess mycomment is why would you want to?
It just ain't necessary to weigh BP charges, if one isas consistent as you seem to be in throwing them with a volume measure. There'd be no benefit at all, because even a full grain difference in the charge weight of black powder will only cause a variation in velocity of around
30 FPS or LESS!
Since a load can have shot-to-shot variation of up to 150 FPS and still be accurate, there's just no reason to weigh the stuff.