Well check them to make sure they're not bad, but yes to your question, I have and use some old powders that my brother and I have had from the eighties, and it's still fine powder today, but we are always careful how we store powder, (cool and dry place).
There are members on this forum who know tons more about this subject, but mostly powder that has broken down or went bad will have a red dusting to it, and smell acidic to an extent. If it's rusty and smells, then it's fertilizer.
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Keep your Axe sharp and your powder dry.
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