If you look at the breakdown of the 6.5 Grendel it’s basically a 6.5x39.
https://en.wikipedia.org/wiki/6.5mm_Grendel
As a matter of fact, I think the only difference is that the Russians just call it a 6.5x39.
That thing yaws & tumbles even better than their 5.45x39. I really wish the US Military would get on board with either this or the 6.8spc. But I “get” logistics and caliber commonality with NATO.
http://www.thefirearmblog.com/blog/2014/11/11/ak-12-produced-6-5-grendel/
Very interesting. Thanks.