Our military adopting the Grendel?

[JASmith]

...So somebody went to all the trouble to create these new calibers to make up for some perceived or real deficiency in the 223... right? Otherwise, what's the point?.

From what I understand the 6.8 SPC was designed to rectify a deficiency in a narrow mission in the special forces. Big Army looked at it, and its merits were seen to be not enough to offset loss of rounds.

Bill Alexander has said that the Grendel was designed specifically as a deer-hunting cartridge for the AR-15 platform. In that, he succeeded admirably, and indeed corrected a civil-side deficiency in the .223...