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Here's what SAAMI has to say about powder:
HOW TO CHECK SMOKELESS POWDER FOR DETERIORATION
Although modern smokeless powders contain stabilizers and are
basically free from deterioration under proper storage conditions,
safe practices require a recognition of the signs of deterioration and
its possible effects.
Deteriorating smokeless powders produce an acidic odor and may
produce a reddish brown fume. (Don’t confuse this with common
solvent odors such as alcohol, ether and acetone.) Dispose of deteriorating
smokeless powders immediately.
Check to make certain that smokeless powder is not exposed to
extreme heat as this may cause deterioration. Such exposure produces
an acidity which accelerates further reaction and has been
known, because of heat generated by the reaction, to cause spontaneous
combustion.
This is a quote from their book on smokeless powder storage. Take it from the experts.
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