Ammo cans, where do you get yours?

I am a man of many tools , this is to say that every thing is not a 1/2 inch wrench compatible.
I distribute ammo in ferrying size boxes depending on the bulk of the ammo .
shot gun shells are unboxed and carefully stacked in a large ammo steel box.
Some center fire ammo is re-stacked in factory packaging without the plastic or foam ,that wastes space.
Rim fire ammo is left in it's own packaging and boxed accordingly .. being they vary in size the box is often irregularly stacked and it's shape is not consequential .
Now if I were rich, building a room specifically for armory it would be different all the boxes would be the same and moved with a fork lift .