I've had alot of experience with steel cased MFS in my m305 over the years(1000-1500 rounds). At first it seemed fine, but the frequency of extractor blow outs kept increasing after the first 1000 rounds or so. Eventually I switched back to brass ammo and the problem was solved. For a period of 1 year, I didnt have a single blow out while using normal brass ammo. I decided earlier this year to go back to steel for another chance, and within two rounds, the extractor and ejector blew out again. I've spent $50-100 on replacing lost extractors, and ejectors(and springs) and I have since stopped using MFS in 308. A small price to pay, but a nuisance when you're waiting for parts in the mail because you ran through all of your spare extractors on the last visit to the range.
Although there was no other signs of physical damage to anything else on the rifle, I found paying a bit extra for ammo was worth the hassle of not having a gun out of action at the range every time. I also noticed that this stuff didn't group as tightly compared to other brands. The chrome lined norc barrel should be able to take steel cased ammo without a problem, so dont worry about wear and tear there. I'd be more weary if your barrel was stainless steel or chrome moly. There doesn't seem to be any issues with the throat of the chamber in my norc barrel and accuracy was pretty consistent over the years. Needless to say, I will never put this stuff through my m305 again, but that's my preference.
Also, this is amongst the dirtiest ammo that I've ever fired and I've noticed it takes a lot more patches to clean the bore after range visits compared to winchester, hornady or remington. I still use MFS.223 in my CQA whenever there's a shortage of UMC in the shop. Not a single problem with the AR except for the PITA cleaning the bore.
If you dont mind eating through your spare bolt parts kit down the road and dont mind spending 2 hours cleaning the gun after every visit, then by all means continue using this stuff. I prefer to take care of my rifle and dont subscribe to the "buy another rifle if its broke" mentality. The money buying a new rifle could have been used getting a reloading kit or better ammo.