SUMMARY SO FAR (My opinions/conclusions)
Looking at mil spec ammo, it appears ammo cans are typically used for brass-cased ammo, spam cans and VCI paper are typically used for steel-cased ammo, and desiccants are not used for either types of ammo.
Ammo cans apparently are not completely airtight, but this apparently is not a big issue with brass-cased ammo.
Steel-cased ammo must be stored in airtight containers such as spam cans, but vacuum-sealed bags (probably metalized film such as mylar), can probably be substituted for spam cans so long as the bags are placed in strong containers such as ammo cans.
Of the 5.45 ammos, Golden Tiger, with its lacquer coating and sealed primers and cases probably stores the best. Others with polymer coatings, sealed primers, and unsealed cases will probably store well too. Silver Bear, with its zinc coating might not store well.
It is not clear how mandatory VCI paper is.
Edited by tbryanh, 10 June 2014 - 01:15 PM.