I've seen my fair share of wrecked extractors. It wasn't Wolf that caused it, because Wolf wasn't being used. A rife that's over gassed and out of time that tries to yank a case still fused to the chamber walls out - something going to give even if the case is brass. Most times its the case head or rim that gives. After enough instances, the extractor can give up the ghost, and they do.
You can't blame this on ammo, it's clearly an issue with a rifle suffering from mechanical issues. Using steel cased ammo in a rifle that's out of time only exacerbates the issue and speeds up the damage/process.
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Ex Mea Sententia