I guess I don't understand your question ohihunter. Each of the MTM plastic ammo boxes you found holds 50 or 100 rounds of 9mm, right? If so, those are the types of ammo boxes full of ammo I store inside military ammo cans. I don't just store loose rounds of ammunition in military ammo cans, and I'd be surprised to learn if many people do. But yes, my military ammo cans are made out of steel. As far as I can tell, those "Cabela's mil spec ammo cans" are too. That doesn't mean I wouldn't buy them though if I didn't already have enough old military ammo cans on hand. By the way, if those MTM plastic ammo boxes you found at 10 for $35.00 are what I think they are, that's a decent buy.