Properly trained firefighters are not afraid of ammunition cooking off. As the videos that are linked above show, it's no hazard. Of course black powder is another story but in 41 years of service I never witnessed an incident involving black powder.
I was told about an incident that occurred several months ago where a volunteer fire department in a rural area allowed two houses to burn because of some ammo cooking off. That's unnecessary and a damn shame. Seems an obvious lack of training.
I will tell you that all the spray cans, solvents and cans of gasoline in your garage can make things interesting.
