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Does anyone try to match both weight AND volume when loading? Or am I being a nitpicky crazy lunatic?
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For any given powder, particularly from the same lot, weight and volume should be in a constant relationship. There would be no reason to measure both because, for example, 3.1cc of Varget will equal (approximately) 42gr and 42gr will be (approximately) 3.1cc. If you know that you have EXACTLY "X" volume then you know that you have exactly "Y" grains, once you've measured it out to get the exact number a few of times. However, lot to lot variations can make this unreliable when you switch from one bottle to another with some powders, so you have to remeasure every time to make sure that the new bottle has the same volume/density as the previous bottle.
Some powder measures measure volumetrically, like the Lee Auto-Disk, and some measure by grains, like the RCBS Chargemaster 1500.
With some powders, volumetric measuring is unreliable because the shape and density of the powder makes getting a consistent volume difficult.
On the other hand, with some powders volumetric measuring has been shown to be MORE consistent, if it's done right.
Either way, measuring by weight is always going to be pretty good so long as the scale is good and used correctly. Volumetric measuring will be good for some powders and not so good for others but typically is more dependent on some level of consistency from the user.