That is all most fire proof safes are (or once were). Between the walls are cells filled with water. As the temperature increases the cells burst and the water will keep the contents from burning or cooking off. Time of temperature is the unknown factor. I am sure with a little sheetrock and heavy plastic water containers you could equal a safe. Remember you do not want the plastic to melt too quickly.Not explode. As was stated, will cook off though. That is the primer or powder getting so hot the round ignites. But bullet one direction & case the other so highly reduced power.
A friend had a shed fire several years ago. He had stored 5gal fuel jugs with water in them then ontop. Plastic melted & cooled off the ammo cans & though the shed was a loss, there were not cook offs of ammo.
I have a medium size locking freezer that I store most of my ammo in, works for me.If nothing else try to get an old refrigerator from the junk yard and store it in that. We had a neighbor a few years ago whose house burned down and when they went in afterwords the food in the refrigerator hadn't burned up although everything else in the kitchen had.
I tossed 500 rounds of 308 in a fire. The case had corroded and was IMO unsafe. We stayed a safe distance it fizzed and popped a bit no big deal .@ Smitti
I Feeled pain on this video, but its a good demonstration.
But i liked more to burn it in my guns ^^
Thx for all the infos at all =)
A fridge is too big for my basement, i think i need to test what happens to a ammocan with ammo on a fire...
But i must look to the laws ^^
greetings and good night