Well, the Army contracted with Winchester to buy $20M worth of the new 6.8 round, presumably with the final specification depending on whether Sig or General Dynamics/Beretta wins the NGSW contract.

https://www.theoutdoorwire.com/relea...7-1de65398d1b1

So, if this happens, our kids will look at 7.62x51 the same way we look at 30-06