Westerner,
Billy gave the right answer. I have poured powder from a can into another can of the same manufacturer, type and SAME LOT NUMBER. I would use a can at a time and then not have your problem of several cans of the same make powder partially full.
If I run out of a can of powder and go to another full can of the same powder, but a different LOT #, I mark the old powder charged and loaded cases with a swipe across the primer with a black magic marker and shoot those few rounds for practice.
Adam
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Adam Helmer
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