If they all go off at once, my formerly happy home will launch toward orbit. There are fire regs that require some quantity in wooden cases or boxes. For moving them around, I think its a terrible idea. I personally mostly use .50 cal cans (or the equivalent). Probably dumb because .30s are heavy enough when filled up. .50s are just too darn heavy when full of reloads. A hint to those who are starting, label the cans. These aren't labels like some idiot would require, these are labels you personally will use to identify the contents, so make them clear and informative. For an example of an idiot's labeling, go to my basement and view the boxes that only say ".44" or ".30-06". Nothing is perfect (well, the young girl that hikes past everyday is close), and ammo cans work well up to about 5 high. But after that you'll want to start a 2nd and subsequent stack.
I've allowed nature to determine the stacking order, and in the last 2 years the ones I don't use have sunk to the bottom of the stack, the most used floated up to the top. You could attribute that to natural selection, or laziness on my part.
For 22 cal ammo, in any volume, use milk cases. Select the fiberglass ones if you can. They're much stronger. But you can put too much ammo in a lot of things and make it too heavy to carry. Ammo cans were designed by evil army folks who enjoyed making strong young men suffer. To suggest ammo cans can actually be moved around is pretty funny, at least for us old men. Its how we developed back problems to begin with.
Most of us probably can't build shelving strong enough to hold a decent quantity of ammo. It means the best place for it is on the floor. A reinforced concrete floor!
Yesterday I was looking at the plastic ammo boxes. Kind of nice, but I'm too old and grouchy to change. If I were young and starting out, I'd consider them seriously. They come with a nice plastic handle that appears to be easy on your hands when lifting them. I have no idea if the folded metal handles on ammo cans was designed for GI comfort, or to inflict even more pain. Regardless, go to a gun show and view the plastic ones sometime. They appear to be squatter and have a little more footprint.
My wife, in her campaign to help, wanted to get the wire shelves that Sam's club sells. They even advertise that they can roll and carry up to 800# or so. She was thinking there's no way Dad could have 800# of ammo. Even mentioned to my long suffering son's who'd just helped move it out of the old house. They just looked at her and frowned. And were thinking just the 22s weighed that much.
So the real trick in all this is to imagine how much total you plan on storing. Then imagine you actually live this long and have been accumulating ammo for the last half century. Then come up with a way to store it that allows movement on occasion and also access from time to time.
