Oh yeah I keep that too. But measure it only in the number of men I could equip for a year. For 5.56, I figure 10k rounds for initial training, 210 for a basic load out, cycle through that weekly on average, lands about 21k rounds per man per year. The goal is equipping at least a squad of 10. Gets way more expensive when we need crew served weapons but I suppose that ammo could be acquired opportunistically.