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I agree, Adam. The fact that no two charges would ever "setttle" the same is the definitive counter-argument to volume being consistent.
I can demonstrate in a repeatable way three different volumes with the same charge.
Dumping the powder through a funnel will produce the least amount of settling, the most airspace and thus the tallest column of powder (in a test tube, for example).
"Swirling" the powder into the funnel so that it goes down with a "toilet bowl" effect drastically reduces the airspace and results in a shorter column using the exact same powder charge.
Swirling and vibrating the test tube, with something like an electric toothbrush, will result in almost no airspace and the shortest powder column possible.
So much for volume being the most consistent.
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