How could or should the 6.5 mm Grendel be improved?

[Von Gruff]

I am reluctant to intrude in this very interesting discussion because I have no military experience and dont even have AR experience --but my 6.5 Gm with 21 in barrel easily takes the 100gn TTSX tp 0ver 2925fps, the 123 gn A Max to 2700 and the 129gn Interlock to 2550 in Lapua fireformed 7.62x39 brass. About all I would like to see with this brass is a little better neck length as when FF I get a case length of 1.5 so another .02-.03 would be good. COAL with the TTSX is 2.380, with the A Max at 2.405 and the Interlock is at 2.320 and I know Sneaky One has his AR magazines except over 2.3 so somewhere there has to be a combination of these paremeters (with adjustments of throating and COAL) that might come within the requirments you are all talking about.