There has been several instances where gun stores burn down, and all the ammunition was relatively fine. In the book I linked in a post in the 45 bunker, it goes into detail on the requirements for a bullet to be cooked off and how it is safe.
ETA: relatively speaking... the whole explosion isn't that friendly.
The ammo in the fire issue has been tested to death, Hatcher did a lot of testing on this, and the NRA did a test a few years ago that backed up Hatcher's research on the subject, they said that a firefighter in regular turnout gear has nothing to fear from ammo in a fire, the only time it really gets dangerous is if it is confined, a loaded firearm does represent a significant risk in a fire.
Years ago I was dirt bike riding / camping with some friends. At night we were sitting around a raging campfire drinking beer & telling lies when one of the guys thought it would be funny to throw a can of engine starting fluid, basically either in an aerosol can, into the fire.
Luckily everyone saw what the guy did and ran for cover. That thing exploded like you would not believe. The explosion actually put the fire out for a few minutes. Needless to say we beat that guy’s ass for being such an idiot.
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