My current powder stock is 34 cans at around 15.5 kg. I keep maybe 2 cans at most at hand for current reloading, the rest are stored in a "facility" well away from the house. I also have a reasonable quantity of black powder stored in another place well away from the house. Likewise no lawnmower fuel is stored in my attached garage. Powder and primers are stored apart from each other. Paranoia huh? Regardless of whether smokeless powder burns or explodes I have no wish to get involved in a scrap with my insurance company if something untoward should happen. I am aware of people who store their powder in old metal ammo boxes - the worst thing to do as the powder is contained. Refer to Vihtavuori's recommendations for storage. But even uncontained powder will still burn quite vigorously in the open. If you have ever scrapped pistol or shotgun powder by burning you will know what I mean. If I have to dump any powder nowadays (rare) I just throw it on the lawn.
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