Originally Posted by
Grouse45
Are you saying if you fill the tube to 120grns marked on the BH tubes, it's truly 120grns by volume? When talking about black powder or substitutes weight means nothing to me. I only concern myself with volume.
If you fill the tube to the 120 grain mark - according to that volume measure it is 120 grains of BH, but when you weight on a scale it weighs right at 90 grains. And according to the conversion it should weigh right at 84 grains. So the tubes and the graduations on the tube you would be loading more the graduation line indicates. But... it is also consistent each time you use the tube.
So in short - loading the tube to the 120 line you would produce a load somewhat heavier than the 120 you thought you were getting. That would compute out to about 128 grain load of BH.