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All of the powder measures with the exception of those new automatic electric ones are based on using a fixed volume to drop the powder charge.
The problem comes when you try to use the weight and volume tables, or you change powder batches. You will notice that most of these tables are incorrect and dropping light.
Each batch of powder has a different weight to volume ratio so each time you use a new can of powder you have to re-check the actual weights and make a new table.
That is why you need a good check scale and set of check weights.
Don't assume that the spoons you used the last time and the measure settings you used the last time will drop the same weight the next time you use them.
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