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Old July 7, 2012, 09:27 PM   #32
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,021
Quote:
Originally Posted by daboon
Wouldn't humidity absorption make a difference?
It does, but you'll probably have noticed the minimums and maximums listed in your load manuals don't offer humidity compensation. The assumption is you will keep your powder dry and, these days, probably store it in air conditioning so it doesn't really fluctuate a lot. You can always resort to sealing it in Tupperware with a desiccant if need be.

Anyway you've tumbled into the great weight vs. volume debate. In the beginning it doesn't matter too much because you're going to work your load up from a starting weight, regardless of the powder's water content. The trick will just be to keep the water content from changing significantly until your load is established. This usually entails just keeping the lid on the cannister tight. If your powder storage is subject to large humidity fluctuations, you can check for a change by weighing and averaging, say, 15 scoops with a Lee powder scoop when the powder is new, then repeat to see if it changes enough to be greater than your normal shot-to-shot dispensing variance. If it does, note the percentage, and check that your volumetric measure is throwing that same percent increase above or below the weight of your stainless wire.
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