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The Creedmoor was never a consideration for a general use AR 15 size rifle.
The 6.5 Grendel was, and with currently available options is the one I'd have chosen. Even then I'm not sure it nor 6.8 SPC offers enough of an advantage over 5.56 to be worth the effort and expense.
The 6.5 CM is a longer cartridge and couldn't possibly be made to work for what the military wanted. But as a semi-auto sniper round on the AR10 platform is already in use by some special forces units.
It's not the 6.8 SPC. The 6.8, 6.5 Grendel and other similar cartridges were tested and eliminated early on in the process. The 6.5 Creedmoor was also tested and considered along with several new cartridges such as .264 USA, .270 USA, 7x46 UICC. Whatever their reasons, they ultimately selected the 6.8 bullet. Not much is know about the cartridge. But will likely be more powerful than the 6.8 SPC and similar in size or power of the Creedmoor in order to defeat body armor found on the today's battlefields.
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