Our military adopting the Grendel?

[stanc]

I am talking about Grendel adoption across the military, since SOF uses the same calibers anyway. 6.5 Grendel would be a logistics issue as a rifle/carbine cartridge simply due to shipping weight, when compared with 5.56.

IMO, that's a very minor issue. During WWII and Korea, they managed to ship and distribute massive quantities of .30-06, which is a much heavier cartridge.