There’s a special reason on the 7.62 x 39 - last August Biden decided not to renew any Russian import licenses for whatever reason popped into his head. Existing ones were allowed to continue until they expired, which they’re doing. Now he’s added an embargo on bank transfers that essentially means that if it’s not already paid for it can’t be. Other Eastern European sources that started to pick up the slack now have the Ukraine invasion to muddy the water. 7.62 x 39 was going up as a result anyway and may start to get mighty scarce. U.S. factories are behind the power curve in picking up the slack because they’ve been running full bore on other scarcities in high demand, notably 9mm and 5.56 and huge government contracts that get first priority because they’re huge government contracts. That’s one reason we’re starting to see those calibers back on the shelves for the first time in a long time. The rest will follow...slowly.
Looks like Palmetto State Armory is getting into the 7.62x39 ammo production game. Primer availability remains a big issue however.