I still have quite a few 7П6 spam cans. I have two AR15 riles in 5.56mm but I don’t care for the caliber much.
Ammo is one area in which it is wise to be diversified, Somewhere, I have an old “Gun Digest” article outlining what early American shooters of 7.62x39 had to go through for ammo. It involved trimming, swaging, and fire-forming a different imported cartridge case, and loading your own.