This is my experience with Wolf ammo a few years ago:
I rapidly fired my AR using Wolf ammo till it was good and hot, inserted a fresh magazine and loaded a round in the chamber. As it was fresh mag and I was not firing, I put my AR on safety and then waited a good spell which allowed the chamber to cool and I concluded this caused the round to adhere to the chamber walls. I then fired this round which had heated and cooled and instead of an extraction, the extractor pulled the rim off the cartridge where the extractor contacts the cartridge. I then needed a cleaning rod and several forceful taps to remove the spent shell from the chamber. I repeated this for educational purposes and have never bought Wolf ammo for an AR since. BTW cleaning the chamber after rapid firing lacquered ammo isn't fun at all.
Note the upper that I was using was of unknown manufacture. Although it shot standard brass cased ammo very well the chamber may have been rough which I can only assume would have intensified the adhesion of the shell to the chamber walls. I have since discarded the unknown upper and have not tried Wolf in my new Bushmaster. To me, it's not worth the time or energy to save a cent or two per round.
Some people discredit the steel casing itself as the culprit. I don't think it is so much the steel shell as it is the necessary lacquer which gums up the chamber and causes stress on the extractor etc which can lead to failure to extract or parts breakage....But once again, under rapid fire conditions and pausing with a round in the chamber long enough to allow the weapon to cool. My Brother and Cousin both shot a bunch of Wolf 223 and didn't experience this phenomenon, but they also shoot a bit more conservatively than I do.
As a note: I do use Wolf ammo...In an SKS or AK in 7.62 X 39, Wolf seems to be very good due to the forgiving tolerances of such weapons and the fact that I shoot them dry without leaving a round in the chamber. Like a cutting torch, burn baby, burn!
Sly
"A miss, no matter how close, is as good as a mile"