I have a RRA that I only shoot Wolf (a test for wear, malfunction, etc). Almost 1,000 round so far & no issues. Extractor seems fine, no visible wear, etc. Yes, it's dirty, but I clean after every session anyway.
I only shoot Tul/Wolf because of the price point... they say it is dirty/inaccurate. I have never had a malfunction(9mm, 7.62x39), but I also use Frog Lube on all of my guns. Any dirt that accumulates wipes right off after use because of the Frog Lube.
FWIW, my Core does not mind the Wolf stuff at all. I think the 20+ year old military ball I have runs a bit better but it is just a feeling. I am no more or less accurate with either. I am not a marksman, my FIL is creapy accurate and the Wolf on the same rifle was near perfect for him at about 200 yards without optics.