Sorry to be so blunt, but this "interview" wouldn't pass muster in an elementary journalism class.
No proof is offered of anything the subject says.
Folks who get shot often don't fall over dead on the spot, in fact it's mostly the opposite. I've been shot, I know. I've shot and killed people that I initially thought I'd missed at the incredible range of 30-40M.
At ranges in excess of 600M the M885 round penetrates better than the 7.62x51.
War isn't like the movies or your favorite cop show.
What makes this GI an armaments expert or ballistics expert?
Most GIs know very little about either subject other than how to operate and maintain the weapon.
Every individual reacts differently when wounded... some guys don't even know they've been hit for several minutes other's (most) know instantly.
On the 6.8... that round is dead as far as the DOD is concerned.... in fact it was never alive.
A couple of NCOs came up with an idea, sold it to somone who could market it and that's as far as it's gotten. NO military unit is using this round, it cannot be supported in the field, has no DOD part #s etc.
Rumors that the Military was even testing this round are BS. Some guys played with it on their own time and then gave very misleading statements to lead others to believe that their actions were somehow given sanction by the Dept of the Army or DOD which is patently false.
Have a few guys taken some personal gear to war? sure, it's happened in every war. 99% of it is optics, slings or other such support gear. Weapons are another matter...
These stories of GIs toting AKs are rarely true, usually it's special ops guys that are trying to blend in from distance...hundreds of meters away. It's not for any aspect of it being a superior weapon.
The reason I rarely post here is because of topics like this....
There's a lot of good information on this board, but as soon as it turns towards the 6.8 or Grendel or what GIs are allegedly toting/using etc. The BS gets a bit too deep for me.