Having large amounts of smokeless powder & primers in your basement would be a hazard in the event of a fire. In the MSDS info it is suggested in the event of a smokless powder fire is to vacate (run) vs. fight it.
Should some 20,000 pounds or so, of unconfined powder be ignited there might be an high order explosion due to extreme heat & massive emmission of explosive gas/fumes. This has happened during WWI & WWII powder manufacturing, probably during the powder drying stage. I don't know of any
extruded smokeless powder being made in the USA. Apparently, there are various safety measures involved in making ball powders allowing making it in the USA.
I keep my powder in 2X thick wood boxes having same size wood lids. Primers are stored in separate areas in heavy wood boxes. I would not want to respond to fight a fire in a house that had 1,200 pounds of smokeless powder & 200,000 primers in its basement.
From SAAMI - 11-3.7 ...... be permitted to be stored in residences where kept in a wooden box or cabinet having walls of at least 1 in. (25.4 mm) nominal thickness
Years ago, I put 1 lb. of H4831, sealed in its factory plastic container, in an about 1 cubic ft steel box that had bare metal inside. I had an identical box also having bare metal inside. The lids of both boxes where not secured, only closed. After 6 months the insides of the H4831 box were lightly rusted; the insides of other box were clean, not rusted. My guess is that corrosive decomposition products migrated thru the plastic walls of the powder bottle. Probably, this is one of several reasons why wood containers are suggested for powder storage. Calcium carbonate (CaCO3) is commonly added to powder to reduce the decomposition rate.
www.hodgdonreloading.com
I'm real old and at one time in the distant past I bought surplus H4831 in 2 1/2 gallon gas cans.
The little .22-.250 with a fast twist barrel, 8 to 7, loaded with 75-80 grain bullets is an effective reduced cost longish range rifle. Like powder charges in the mid 30 grains and ranges of 800 yards or so. Like 180 or so rounds loaded per pound of powder vs. 97 or 132 or so with other rounds. Not so good for shooting big beasts like elks.