I've used Wolf Ammo for years, in the following calibers: 9mm, 7.62x39, .223mm. Never had any problems. Last year I purchased 3,000 rounds of what I thought was 9mm Wolf Ammo from an online retailer. When I opened the shipping box, I was surprised to see white boxes rubber stamped "Tula". I thought it was a mistake, when I opened up the individual box, I saw that the headstamp stated "Wolf". I did a little asking and a friend of mine told me that Wolf was the commercial name for ammo, manufactured at the Russian munitions plant in Tula, Russia. Thus the Tula brand name.
Tula's quality control is NOT good. After firing 1 1/2 boxes of the Tula ammo, the Glock 19 being used blew apart, luckily no one was injured. I had to send the pistol back to Glock for repair, explaining what happened. The frame had to be replaced. Wolf paid to have the pistol repaired. I sent the unfired 9mm ammo back to the retailer and they let me exchange the rest of the unfired ammo for American ammo. I never had problems with the Wolf branded ammo. I still use the ammo in my SKS and AR. Just wanted to let the readers of this thread know about my experience with "Tula".