I guess I should remark on why my average on hand round count is so high (1,000 for what I shoot most). It isn't because of zombies, the breakdown of society or gun banning.
It's based on how fast I expend the rounds, how long it takes me to find a decent deal and get buy a resupply and how much I can afford to pay for a bulk shipment.
I have a single shot .243. The on hand average is 40 rounds. When I hit 20, I look for two boxes to buy. (I have the dies to reload, but I haven't transitioned to reloading yet).