Mentioned before, but COFFEE CANS DO WORK. the 3# size will hold between 500 and 550 rounds of 45ACP, and a whole lot more of 9mm or 38 Special. The snap on plastic covers are at least reasonably dust free, and they stack neatly.
30-06 and 308 went into paper cartridge boxes, which were placed into 30 cal ammunition boxes, ex G.I. ammunition cans, which held 400 rounds of 30-06 or 460 rounds of 308. One used to get them almost for nothing. They cost more now. The 30 caliber ammo cans, above mentioned are good for storing either pistol brass or loaded ammunition too, and they are virtually waterproof. LOL.