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

[stanc]

BTW I sort of felt that a 6.5x45 might be a better round than the 6.5 Grendel (6.5x39). But the Grendel at least works in our current rifles so less replacements of weapons, initially.

A fact that almost certainly does not matter. In the last 125 years, the US Army has never adopted a new cartridge to upgrade old weapons.