Seriously, this blows a hole in the theory that commonly available calibers is the way to go. If everyone wants .223, then .223 will be the first to fly off the shelves. This also blows my belief that the stores cannot be cleaned out in anything less than a full blown crisis. There is nothing on the shelves and we are not in collapse mode. It has me rethinking a lot of my preps.
I think the better reason for commonly available calibers is the price of stocking up is lower. I think in a real shtf, you better already have what you need.
I probably have 2000 or more rounds of 5.56/.223 ammo, and I won't be firing it until I know I can make or get more.
Thankfully, I have an AR upper in 5.45x39 which I have over 10,000 rounds of, and I have a 22LR conversion kit and 40-50,000 rounds of 22LR so for the duration of the ammo shortage these will be what I am using.
As a matter of fact, I can't find a bolt for my latest AR build, so the 22LR kit will serve as the bolt for that weapon until I can find a BCG.
I've learned a lesson on building ARs, I got caught with a few barrels, some stripped lowers, but without any upper parts. I tend to buy in bulk when I get stuff on sale, but can't build a complete rifle despite having what some people would consider a great collection of parts. In the future I will be more moderate in my bulk purchases and spread them out. The bright side is that I have sold enough stuff to pay for my dream rifle.