I think that the big jump came because of all the new fire enthusiast that showed up during COVID. They were buying anything and everything and stocking up for the next apocalypse. Look at what happened in grocery stores, and a number of stores still haven't recovered from all the panic buying that went on.
The one thing that gets me is that you can buy all the 5.65x55, 223 Rem, 7.62x39, 9mm, and .40 S&W that you want and at bargain prices. I picked up 1000 rounds of 40 S&W this past summer cheaper than I could load it for.
Here is a little read on the shortages:
Why is there a primer supply shortage? The pros at Powder Valley discuss the causes of The Great Primer Shortage of 2020, and what you should do about it.
www.powdervalley.com
By the way Mark, I may need to buy that pound of power back that I sold you a couple of years ago.