This has made me want some answers so I went through some very old black powder books I have and the internet.


In my search I also found this:


Oh, I also justread that possibly one volumetric grain of BP is = to a 1 grain of water byvolume. So if you filled up a 60 Vgr BP measure with water, the water wouldweight 60 grains on a scale. I will have to go check this to see if it iscorrect. If so it would be easy enough to calculate volume of a measure. I haveno idea if this is true or not.


To check this


The weight ofwater equals 62.4 lbs for a cubic foot. This works out to 998.4 ounces.

We can take the weight and divide it by the cubic inches (1728 cubic inches ina cubic foot) to find what a cubic inch weighs.

So 1 cubic inch of water weighs .5777777778 ounces

1 ounce = 437.5 grains. Thus 1 cubic inch of water weighs 252.7777778 grains(.5777777778 ounces * 437.5)

volume = Pi * radius2 * length

So lets put this into action.

If we have a cylinder that is .39" in diameter and 2" long first wefind the volume.

V=3.14*.195(sq)*2 = .238797 cubic inches

So .238797 cubic inches * weight of one cubic inch in grains(252.7777778) =60.36grains of water by weight.

I checked this with a powder measure and it works out to be within a grain ortwo of the math.

There you have it. A black powder volumetric measure is based on the weight ofwater.

So one volumetric grain is = to one grain of water.

Greebe