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While Slamfires information is very good, I do disagree that we are not aware that there is an agining process.
Many of us have picked up old powder and check it for condition.
Basically we are assessing it to see if it has aged out. Cooler climate of course have an advantage in that it ages more slowly and can last a long time.
I also test older powder loading up 5 and seeing how it performs though if its iffy or small quantities exposed to a lot of air I just pitch.
My brother had some suspect powder that he tried and found out that suspect really meant pitch. He did not go whole hog, first one was a bit odd the second was for sure.
One reason military power was stable is probably the bunkers themselves acted as a temperature buffer being buried. Not a sure thing but a help.
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