Hey Gig,
I have several rifles that shoot 7.62X39, and they are not all the same bore size. There are two AKs, two Russian SKS and a very fine Chinese SKS, a Colt AR-15, and a Ruger Mini 30. I bought most of these guns 15 or more years ago and decided then that I would need a supply of ammo to feed them. I made a good buy on a thousand rounds of Lapua 7.62X39, and it was good stuff with Boxer primers. After shooting the original ammo, I reload for all the guns using my own 150 grain hard cast Loverin design bullets with gas checks. For the AR and the Ruger, I use my cast bullets after being lubed and sized to .309 and .310. For the other guns, I lube them in a .312 sizer that really does not size them at all. I also made a large purchase of Russian 123 grain full metal jacket bullets and use them on some occasions.
Obviously I have never had a need to purchase the Wolf and other similar ammo. I try to stick with buying reloadable Boxer primed ammo so I can then use it to make my own.
Best wishes,
Dave Wile