If you're in the market for 7.62x39 ammo, I would stay away from "Tula":
I had no problems with this ammo feeding or firing... the "problem" is the ammo is loaded light. So light that when my buddy fired some I noticed "geez that's awfully weak sounding".
I tried some and it felt not much more than a .22
So, I tried a mag of this stuff immediately followed by a mag of "good old" Golden Tiger. WHAT A DIFFERENCE! The Golden Tiger has literally twice the bang and twice the recoil.
I didn't chrono the two brands, but the "real" stuff literally seems twice as powerful.
Upon coming home, I pulled a few bullets out of the Tula ammo. As I expected, they are only about 2/3 full whereas Golden Tiger is packed full to the brim.
Also, you can shake the Tula near your ear and hear the powder inside... not so with the G.T.
For what it's worth... The Tula ammo is no bargain.