Call your local fire dept and ask them. You will more than likely find a restriction on how much powder you can have in a residential area without a permit from the fire dept and you’ll need a separate storage facility away from the house.
The last thing you want to do is call any kind of official and tell them you have x pounds of potential bomb making material in your house.
an open powder keg is one thing. Ammo already loaded is and has never been an issue with the fire dept.
Even in a fire, loaded ammo may sound like firecrackers going off. But without a directional mechanism the lead is not projectile in nature because the shell explodes sideways.
As for calling my local fire dept for advice, forget it.
They are in most cases loyal to the establishment, protection racket. Advertising anything of a personal nature is opening the door to harassment by overzealous protectors.