I'm tired of all my ammo sitting on the shelf, its a pain to move and sort through, etc. I thought picking up some ammo cans might be a decent way to at least lump similar ammo together in an easy to move way. Are .30 caliber cans the right size for this though or are they going to be too small? I'm wondering if maybe .50 isn't more suited. Which do you prefer for stacking boxes of ammo in?