Started doing mathematical measurements but my head almost exploded. Instead, I took a .451 ball and seated it just below the rim of the cylinder, pulled the cone out and back filled it with black powder.
At first 30 grains seemed to fill it up, so the cone was re-installed, the cylinder put back in the frame and the ball rammed down to test. It went down some more!
Pulled everything apart, unscrewed the cone and used some brass rod to bring the ball to the desired position in the cylinder and refilled the cylinder again. This time another 2 grains or so went in.
The Goex FFFg powder was measured 3 ways. First, by the Treso powder flask 30gr nozzle. Second by the Traditions powder measure with funnel and lastly by my new Chicom powder scale. The Treso nozzle was filled to the brim, putting it in the Traditions measure left about 2 grains too much when set at 30 grains. Lastly the scale said 32 grains by weight.
Anyways, all this to figure out how much filler is needed to keep the ball nearly flush with the top of the cylinder for a given load. Is it right that the capacity by volume behind the ball (.454) is supposed to be 35 grains?
So shooting 24 grains of BP, one would need 9 grains of filler, right? My brain hurts!