I hadn't realized that the BATF has specifically exempted that round from the AP ammo ban. Thanks for the correction.
.30 '06 AP can be bought, because it's not considered a "pistol" round.
7.62x39 is considered a "pistol" round, and is not exempted. Back in the early '90s, you could buy ChiCom 7.62x39 that was steel core. Crap, but cheap. Then somebody made a 7.62x39 "pistol" and BATF cut off imports of the stuff. Then X42 cut off imports of anything firearms related from the ChiComs.
At least, that's how I remember it.
There is no AP ammo ban. You can buy .50 BMG AP, API and APIT if you want (when it’s available.) I’ve bought all three this year.