Alternative to 6.5 Grendel?

[stanc]

All my experiences with M855 on human tissue have been very consistent: Avulsive tissue destruction, larger-than-normal wounds with grotesque characteristics, life-changing or life-ending terminal performance.

If there is one cartridge we should be looking at that needs replacement, it is the 7.62 NATO.

I do not doubt that your experiences with M855 are other than what you claim. However, I'm sure that you can have seen only a very small percentage of wounds inflicted by 5.56mm weapons. Plus, tests done by Fackler and the US Army do show variations in onset of yaw with M855, as shown below.

I can't agree that 7.62 NATO needs to be replaced. It works well enough as vehicle armament and in a number of other applications. But, I can see where it might be a good idea to field a SAW/DMR cartridge that is smaller and lighter than 7.62 NATO.