Hello, i am a person that worries a good deal and i want to make sure i am taking steps that are reasonably safe to store blackpowder, 777 and white hots.

All my bp is in plastic containers. I plan to put everything (including caps) in a type 4 indoor storage container that i saw online (about 200 bucks). I am then going to keep the box in a plastic outdoor storage chest. (The kind of chest people use to store lawn supplies. The chest will be shut but not locked. The chest will be about 20 yards from nearest house.

Thoughts? Any other reasonable plans that i can take that would protect my family, house or any firefighters in the event of an emergency? Thanks.