From the testing we've done over the years, Lapua is the most accurate of all the available 7.62X39 ammo (including Chinese & African ammo made on Chinese equipment). Lapua was also the only brand that used true .311" diameter projectiles.
The least accurate ammo on the market is from Tula, whether it be branded TCW, Wolf, TulAmmo, etc... We found the projectiles were often out-of-round. I pulled projo's from a box of Wolf HP last year to find they varied from .3095" to .310". I also notice neck tension on some rounds so loose the projectiles nearly fell out on their own. Neck tension is very difficult to regulate with steel cased ammo under the best conditions. Too tight, and the neck will crack.
Out of the "zoo" ammo, I found the Brown Bear labelled ammo by Klimovsk with copper washed steel cases to be quite accurate. It's performance was on par with Chinese ammo of the same design. And it has a boat tail projo if you seriously have to have one. If you want good accuracy at an affordable price, just go with the American made fodder. I'm sure you can find one that is quite accurate in your rifle.