Interesting read and data here on the M855A1 and the issues with current service rifles. Probably won't be a surprise to many at how the "brass" in charge of making decisions in government screwed this one up and didnt look at the whole picture.

http://smallarmssolutions.com/1/post/2017/11/the-m855a1.html

"I see this as a good round "if" we had a weapon to fire it. We don't have such weapon. What little benefit it offers is not worth destroying an entire fleet of M16A2/A4 and M4 carbines used by the U.S. military, and the cost which will go into frequent barrel and bolt changes. The ammo is not worth the cost of having weapons fail in combat by either the troopers not having the proper magazine, or their bolts breaking, or their bullets keyholing, due to a worn out barrel in 3K short rounds. The better alternative is the M855, as it keeps the barrel serviceable to 10,000 rounds or more on a properly maintained rifle. It is a mistake having ammunition not compatible with our allies weapons. This could cause major problems if we had to resupply an ally in a bind and their weapons fail to function because they don’t have an EPM or a Gen3 Pmag; also when this ammo causes parts breakage in their firearms."

-Chris Bartocci

Who is Chris Bartocci? A former forensic firearms examiner for 10 years and then went on to work as a technician and consultant for Colt Defense, LMT, and Otis Tech. Bartocci wrote Black Rifle II on the history of the M16 and has written over 75 magazine publicans on weapons and ammunition. Bartocci still travels internationally and domestically training and consulting with LE and military units on weapons maintenance and demonstrations.

Check out his YouTube channel "Chris Bartocci". I could watch this guy all day and just finished watching a 30 minute video on the history of the development of Pmags. 

I have shot it at distance and it is hotter than previous offerings. In my experience 855A1, shoots as well as my 77 load.
https://www.army.mil/article/86321/armys_newest_general_purpose_round_shows_accuracy_in_rifle_competition

the article you cited seems accurate to reflect highpower service rifle loads. It is a widely, generally accepted rule of thumb to change barrels out at about 3000 rounds amongst competition shooters. Kriegers may go out to about 5k and I read about some melonited barrels that exceed that.
Its a give and take. Want a better terminal ballistic ammo? Or do you want longer barrel life. Until we have a laser, barrel life is a compromise. It's difficult to get .22LR barrel life when you want 22-250 performance.

To add it is challenging when most of the US Army goes to a carbine. In my opinion we shouldve stuck with M16A4 MWS. A 20" 1x7 twist barrel does help maintain velocity. Not everyone needs a carbine.

Damn!

its 322 seconds in 556 caliber
again...
556 Pee magazine in 223 calibers - half a second...
...a ghost gun

Damn!

Correct me if I’m wrong but isn’t this why magpul developed (and submitted to trials) the pmag M3 to remedy this issue by designing the magazine so the bullet sits higher than standard aluminum and the pmag M2?
If that’s the case, then then all branches should really be considering in replacing the crusty crap aluminum mags with the M3.

Correct me if I’m wrong but isn’t this why magpul developed (and submitted to trials) the pmag M3 to remedy this issue by designing the magazine so the bullet sits higher than standard aluminum and the pmag M2?
If that’s the case, then then all branches should really be considering in replacing the crusty crap aluminum mags with the M3.

Yes it is, and the M3 PMAG performed far better than any other available mag. Several units and entire organizations within the military have already made the move, ahead of the actual branch doing so.

the article you cited seems accurate to reflect highpower service rifle loads. It is a widely, generally accepted rule of thumb to change barrels out at about 3000 rounds. Kriegers may go out to about 5k and I read about some melonited barrels that exceed that.
Its a give and take. Want a better terminal ballistic ammo? Or do you want longer barrel life. Until we have a laser, barrel life is a compromise. It's difficult to get .22LR barrel life when you want 22-250 performance.

This is true for competition shooters but I don't believe the military abides by this.

This is true for competition shooters but I don't believe the military abides by this.

I meant to refer that to competition shooters.