According to these instructions for making it, the BP ingredients are weighed:
Quote:
...The main stages in making black powder can be summarised as follows:
Weigh and mix the raw ingredients (green mix).
Mill the ingredients to a fine, incorporated powder (meal powder).
Press the meal powder into a solid slab.
Break the slabs into grains (corned powder).
Sieve the corned powder into different sizes....
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...The standard modern formula for black powder is:
Potassium Nitrate 75
Charcoal 15
Sulphur 10
n.b. these are parts by weight....
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...Weigh the ingredients carefully and place in your ball mill, ensuring that the total charge takes up about 1/4 of the volume of your milling jar. Then add your milling media (which should 1/2 fill an empty milling jar).
Because the Sulphur and Charcoal are much less dense than the Potassium Nitrate the weighed ingredients don't look that much different in volume - trust your scales and not your eyes!...
http://www.thegreenman.me.uk/pro/bp.html
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