Eh, that's kind of an extreme position. I don't baby my guns, and I certainly won't spend double or triple the price of ammo just to marginally extend the life of a $400 barrel.
My question was about reliability of the ammo itself.
I won't run it in my rifles because my PWS AR does not use a standard AR barrel from what I can tell and I wouldn't replace it with anything other than a PWS barrel since it is isonite treated and button rifled which appears to make it more accurate than most standard barrels. Ordering one of those is not going to be fun.
As for barrels being a consumable part of an AR or ACR. No thanks, I'll get as much life as I can out of mine since I don't buy $200 barrels but instead opt for $400-$600 custom built barrels which actually are capable of good groups.
As for reliability it sounds like MFS is definitely more reliable. Wanna know more about Norinco ammo just search the many many many many many posts on this site with guys complaining about keyholing, undersized projectiles, primers falling out and jamming up the trigger group, and pierced primers.
Everyone is free to run whatever they want and tolerate different levels of performance for their money.
I've watched a buddy with his XCR shoot 5-6 inch groups with Norc ammo and then I gave him 10 rounds of dirty bird to try and the groups shrank to 3-4 inches.
To me it just isn't worth the risk of getting one of the off-spec cases or buying ammo that is only good for making noise rather than actually hitting targets.
Bi-metal jacketed bullets will ruin your barrel no matter what anyone says. Think about it. Copper jacket in steel rifling, copper is much softer and will be the material to deform and wear. Bi-metal means steel/alloy which will be almost as hard as the rifling and both the barrel and the bullet will wear.
I've posted links to a test I found in the past where they compared the two and the barrel shooting bi-metal was ruined after around 6000 rounds and the barrel shooting copper jacket was like new after 10000 rounds.
I'll try to find it again and post it for you.
Edit,
Was easier to find than I thought.
http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/