Thanks for all the info fellas. Appreciate it. Looking like I'm going to go with the 6.5 Grendel. Any ideas where to start looking for some parts have a lower and all that goodness just needing the upper half, barrel, BCG. Seems like everyone is completely out of parts right now.
Even if there were good long range 6.8/.277 bullets they would be too long to fit into the AR15's short magazine. The current 6.8SPC loads pretty much maximize the OAL that is possible to use in the magazines and so even a modest improvement in the Ballistic Coefficient would require a longer/heavier bullet and that can't fit into the 6.8 case and feed through the AR magazines ... unless you seat the bullet back into the case, at which point you lose powder capacity so now you have the worst of all worlds, a heavy bullet with less powder to push it.Not to hate the 6.8 or .277 bullets but they are also not as popular to use and thus there has not been as much devlopement with those bullets for long range