There are guidelines for primer/powder storage in publication 495 by the National Fire Protection Association (NFPA). The residential limits are 10k primers and 20 lbs (smokeless) powder, although if the latter is in wooden magazines with 1" thick walls, the limit is 50 lbs. Apparently many municipalities have adopted NFPA 495 as the law.
SAAMI published three PDFs with the relevant excerpts from NFPA 495: primers, powder, and loaded ammunition. The text is on the last or 2nd to last page of each document.
I also found an interesting paper produced in the UK circa 1998 regarding detonation risks associated with storing powder in buildings. Strangely enough, the study noted found that smokeless powder is less volatile than black powder (called simply 'gunpowder' in the paper).
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