Well you goobers got to my small brain and I ordered a shelf today so I can store all my ammo cans in my bedroom. I can now sleep peacefully with mucho ammo next to me. Thanks for all the recommendations and answers.I store mine in "sealed bags" in ammo cans in hot ( 90's F ) garage. Military ammo has been stored in warehouses in hot deserts and jungles for extended periods.
I recently fired 3 mags of Remington Golden Sabre that had been in my car 'lock box' for about 24 months. All 30 rds functioned perfectly. I was hoping for that but was concerned enough to test and replace.
There are plenty of plans to remove your box spring and bed frame and build a platform base that can be used for storage. It's free space. You can use heavy duty full extension drawer slides or a set of Murphy bed hardware to lift the whole mattress.If you want to store them under your bed in the climate controlled house, that is perfect IMHO, and makes use of space seldom used. As a bonus you can't do vaccuming there anymore.