It should be fine in our Chrome lined M-14 barrels for many rounds. When the barrels accuracy drops off enough after probably thousands of rounds, that would make a good excuse to re-barrel with USGI, criterion etc and probably lap in a USGI or equivalent bolt. But never till the barrel is done, unless you are competing and need the tighter groups. My barrel has over 1000 with probably
What alot of shooters miss with ammo is this,...for marksmanship fundamental practice any good bulk ammo is absolutely fine. All you need to do is by benching, scoped if you have one mounted, determine the inherrent accuracy of the rifle/load combination and note it.
So your LRB shoots an average 3 Minutes of angle with Norinco ammo for 10 shots. Okay we have our base line, now see how many rounds you have to fire prone over your iron sights to get consistent 12" groups at 400 yards! You now are releasing each shot perfectly because the rifle can't do any better with this ammo, your 12-14 inch group is showing you this. Try punching 6-8" groups at 200 yards standing with the 3MOA ammo, you are now a rifleman.
I'm preaching to myself here, I need as much practice off- hand as anyone, and I know it will improve my field shooting for game hunting.
Absolute accuracy off the bench is better left to BENCH REST shooters, and is not what M-14 fun is all about.
When you want to compete in service conditions maybe with you M-14/M1A, now we need to load up, or find the best ammo we can afford and our rifle likes. If you can shoot 2 MOA prone unsupported, why not be able to produce 4" groups at 200meters with your rifle, if scoring is what it's all about. In the mean time, the cheapo ammo allowed you to practice and improve marksmanship, never intended to shoot little tight groupies off the bench.
I see these guns benched so much at 100 yards, scoped alot, and the fun they can produce in all the shooting positions with iron sights lost.