Optimized Caliber

[stanc]

6mm...doesn't have the retained energy a lot of people expect out of an LMG for 500-800m terminal performance, so that is why I lean to the idea that a 6.5mm in the 130-140gr class is ideal for a Multi-role LMG.

You may be right, but I don't see how you're going to get practical "green" bullets heavier than ~120gr.

And in order to attract attention of anybody in the military, won't it be necessary to demonstrate that a 6.5 LMG actually can deliver the required performance?