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Wat Billy says is the "correct" answer.
I'm too much of a tightwad to do that, and have always mixed the dribs and drabs of the old stuff in with the new. It's fine as long as they are the SAME powder, from the SAME manufacturer, and the old stuff hasn't gone bad.
This applies ONLY to canister-grade powder. Military grades, or military "pull down" powders should not be mixed at all. because they vary way too much from lot to lot.
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