Tam noted that the "oddball" calibers get shot more because there is less competition for things like 44-40 and 257 Roberts than there is for 223 Remington or 308 Winchester.
I concur. I have not seen a shortage of 7.62x54 or 8x57 in the stores, which makes it all the more ironic that I'd already stocked up on those cartridges.
Secondly, reloading components are easy to buy in bulk, but common caliber projectiles are the first to go. After all the 30 caliber projectiles work in all the popular 30 caliber cartridges. The only 30 caliber rounds I could find were 130 grain or lighter, good for varmints but not much else.
However there were plenty of 6mm, 25 caliber, 7mm, and .311 bullets to be had.
Lessons learned. Buy primers and powder in bulk, and buy powder that can work in a bunch of different rounds. When bullets get scarce it is good to have a few rifles on hand in various bore sizes, that way you can always load up something to shoot.
Comments are encouraged, if you noted anything to help get through the next big ammo shortage.