Originally Posted By: msincAs I understand it, the Army first tested the 222 Remington Magnum as the cartridge for the AR platform. Barrel life was not what they wanted with that round so they went to the 223. My experience with the 223 is that barrel life is fantastic. I shoot mine a lot, own a borescope and have never done any damage yet. One thing that can happen to small bore high velocity rifles is that they build up a hard carbon "ring" right at the throat. It can be tough to get out and it will open groups just like a shot out throat.
I was first told about this by the folks at Pac-Nor barrels and have since seen it a few times. A borescope is a handy thing.
.224 Springfield, among other names it was, but the 222 Rem mag was what Remington standardized it as, but was never considered by the military as 222 Rem mag. Barrel life is not what killed the .224 Springfield. FYI.
With modern barrel steel, you are talking many many thousands of rounds with either the 223 or the 222 Rem mag for barrel life for everything besides benchrest competition. MOA or there abouts will last long enough to make your trigger finger look like the right leg of a old school Harley rider with a kick starter. That's a lot of trigger time.