You want the medium size, 0.8 CF. When they are full, they are quite a thing to lug around. I see them in Staples for around $85. each, while Sam’s has them for $45. They are black, and on the palettes the cardboard containers crush easily. Even a crushed box probably contains a good fireproof box inside. You can fit 18,000 22LR rounds in one, or 1500 223 rounds, or about a thousand 357 magnum or 44 magnum rounds in one. They probably weigh a hundred pounds full. The thought is simply that I don’t want a fireman endangered with rounds cooking off or the rounds water damaged in the basement. As to the rating, 30 Min at 1500 degrees is typical, and they need to be stored alongside a cement wall on the floor. No stacking and no shelf storage is allowed as they could fall and break open in the fire.
http://www.samsclub.com/shopping/navigate.do?dest=5&item=411269
Thanks for the info :)