I keep a certain amount of each caliber put away. Don't even count it as having any. Even if I had 30 boxes in my stash, and 3 out, I have three boxes.
I'm down to 6 boxes of 223, I could buy 20 more and I'd still have 6 boxes.
It's a good way of keeping what you need on hand.
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.22LR, 9x19, .40 S&W, .45 ACP, .45 Colt, 5.56x45, 7.62x39, .303 British, 308 Winchester, 30-06 Springfield, 7.62x54R, 8mm Mauser, .50 BP