Ah, the dreaded ammo fire. I can say due to my profession I am aware of this. I am not worried about ammo being stored, when I go into a house fire. However I am worried about powder containers, most made of plastic now days, and the provocation the powder will cause if enveloped by fire. My reloading area included. I say the best place to store powder is in a flammable cabinet, same as fuels. Ammo, i have heard it cook off inside houses on fire, no big deal. However I can mention a story that changed the way I look at firearms and fires. One afternoon we got dispatched to a house fire. 75% involvement. Upon arrival 3 LP tanks were being inpinged upon by flames, and overpressure valves were activating. That is an attentiom getter, only option keep water on them, or back away and let them blow. Well we cooled them, then began extinguishing the house as best we could. We progressed to the front door to make entry, but the floor fell through upon me putting my weight on it, so we had to fight it from the exterior. Well that involves moving from window to window and doing your best to extinguish as much as you can. Interior attacks are far more effective, although more dangerous. Any how I could hear ammo cooking off, and some gunshots come from the house. Well after the bulk of the fire was out, and smoke was clearing, I could see better inside through the windows. Turns out at one of the windows where I had been doing a window attack from their were 3 guns, laying pointing muzzle towards the window. They were heavily charred, a double barrel 12, 30/30 lever, and a 22 bolt. Well I being a gun guy decided to look at the remains of the guns. Well to my surprise the shotgun had 2 empty shells in its closed breach, lever gun same thing. So while the fire was burning, the rounds cooked off in the chamber of the gun, and probably blew the window out. I just thank god me and my guys were not standing in front of that window when they did. So ammo on fire no big deal, ammo loaded in a gun, or gun powder make me a little more edgy.