During the last ammo panic, the lack of sufficient manufacturing infrastructure was rimfire. The manufacturers looked at the panic as temporary, so they didn't spend the big bucks increasing rimfire manufacturing capacity because they figured things would get back to normal in due time. It took them 3 years to realize that wasn't going to happen. Once they finally invested in increase manufacturing capacity for rimfire, the panic petered out rather quickly.
Primer manufacturing is the most expensive AND dangerous part of centerfire production. And unlike just adding more shifts to stampers and punches to churn out more brass casings and projectiles,...the individuals who don the hazmat suits and actually walk into the primer compound magazines to make them are not quickly or easily trained up and reproduced to have greater production.
Word has it that demand for factory ammo is so great at the moment, that all primers are being consumed in that endeavor, leaving almost none to distribute for reloaders. As Boriqua said,...not a conspiracy,...just supply and demand.
Suppliers are trying to supplement the primer supply chain by importing overseas supplies, like Fiocci, Wolf, Sellier & Bellot and CBC,...but that isn't as instantaneous as just calling in the order and getting it overnighted to a warehouse. Anyone who's ever been involved in the business of international shipping and dealing with Customs knows what I'm talking about. It takes nearly 3 months for a hazmat product like these to ship, arrive and sail through customs if everything goes well. Any little hiccup along the way, such as paperwork errors or payment delays on either end will make it all take even more time.