US Army Considers Adopting an Interim Battle Rifle in 7.62NATO: eventually adopt 6.5

[stanc]

I participated in those discussions and, yes, gradually came to understand that replacing the 5.56 with the Grendel would ultimately not work well, but that a 6.5 caliber medium machine gun could work.

I do remember being in many discussions about replacing 7.62 NATO with 6.5 Grendel. I just don't recall any threads about replacing 7.62 NATO with .260 Remington or 6.5 Creedmoor.