I don't know so many haters of the 6.8 like Craig Black at Modern Sporting Rifle, saying the 6.8 can't hold up to the 6.5 Grendel I just thought I would pass over them all and get a 308...at that point I can laugh at the caliber wars and just have the best!
I read that I do not think he was saying it will not hold up he was saying both calibers are doing well without military adoption.
He is wrong about the military use I know several guys that were issued the 6.8 in Iraq and loved them one was my friends son he was issued the 5.56 on his first tour and the 6.8 on his second. He said the targets dropped with much more authority on his second tour.
The 6.5g and the 6.8spc are close enough that I really don't think a hog will know the difference. I personally choose the 6.8 I think it has the potential to over take a lot of calibers in popularity.
.308 is great also.
I think these people sink their money into a caliber and then want it to be the best. This results in having Internet pissing matches to justify their decisions. The 6.5, 6.8 and .308 are all effective hunting calibers.