i guess my point is this. you could have an open flame in front of a stack of ammo cans for 10 years, and there wouldnt be enough leakage of any kind to allow combustion or fire of anything other than the initial flame. #1) there just isnt much (if any) flamable gasses leaking, from either the cartridges themselves, or the ammo cans. #2) even if there was some leakage, it would not be enough to ignite (there has to be enough of a concentration percentage wise for combustion to work. #3) even if there was enough fumes escaping for ignition to occure, the flame front would not get back inside the ammo can to ignite the the "fumes" inside of the can, and #4 even if all the above could happen, the ammount of fumes would not be enough to make the ammo can an explosive device. these were designed for long term storage of ammunition, both in armories, and under battle conditions. if there was going to be danger of these things turning into bombs, with out someone purposly making them into bombs, they would have been redesigned so the danger was no longer a threat. it's just not going to happen! i hope we can put this to bed now. i am done with it.