Doctrine and why the Grendel has an uphill battle.

[stanc]

Perhaps, this will clarify:

(https://en.wikipedia.org/wiki/5.56x45mm_NATO)

I hope it clarifies the matter for you. It confirms what I said: The 5.56x45 cartridge did not become a NATO standard round until the late 1970s.

Now, can we please drop all of this trivia over historical matters of no importance?