I've seen the extractor damage, and I've had to clear more than a few stuck Wolf casings out of the chambers of Stoner rifles.
Usually, I make a big show of dropping a cleaning rod down the barrel, grinding my teeth, and yelling "this is gonna hurt!" before thumping the rod to clear it. The more expensive the rifle, the more dramatic the owner's reaction is.
Someone will reply that they've run 6400 rounds of Wolf through their Wylde-chambered race gun in one sitting without a single issue. Heck, they've got talking cars and telephones that browse the internet--I suppose anything's possible. Still, the stuff is fairly wretched for accuracy, and the risks are real.
I suppose it's OK for the Eastern Bloc rifles, but I really don't recommend its use in an AR.
In the depth of winter I finally learned that there was in me an invincible summer.