IIRC, the PLA have a a 5.8mm round at the platoon level. They use a light bullet for IWs and a heavy round for MGs and Sniper rifles. 6.5 Grendel (and Grendel was chic according to the movie) has that possibility,
BUT it will lead to an overall increase in carried weight for IWs. 300 rounds of 5.56 = 9lbs and 300 rounds of 6.5 = 10.8lbs. It may save weight across the platoon. I have still to crunch the numbers on that.
I do not know how 6.5 compares to 5.56 for a 5-8 round burst dispersion at 25m. With more felt recoil, it probably has higher dispersion.
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