It is important to only store powder in a plywood or similar box that does not have a great deal of strength. In the unlikely event of a fire then the containers just burn with doing anything life-threatening. If you lock powder in a steel safe or other strong container then in a fire it will build up pressure when it ignites and blow apart with considerable force. A tight, strong seal, the bigger the bang! I store mine in a cupboard in the garage in a plastic fish crate. It the event of fire it can be quickly moved to a safer place.
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