Great writeup, szihn. And pretty much describes exactly why I went with the 6.8.. in addition to after talking to and not being able to get straight answers from just about every 6.5 Grendel barrel vendor out there. Not so with Harrison at AR15Performance. My requirements were 300 yd and under gun with excellent accuracy and bang-flop termnal performance from a 16" barrel at those ranges from the get go.
And, as you mentioned, also have at my disposal .223/5.56, 6.5 CM, .264 WinMag, .270, .30-06, .45-70.
