This brings up the question regarding the studies that most gun battle engagements occur within 250m or less. Does every rifleman need a weapon that can cause certain levels of damage up to 600m-800m when the damage caused by the 5.56mm, in the ranges of typical gun battles, is probably more than enough? Don't get me wrong, a heavier caliber is still needed for when an opportunity for those rare long range shots arises, but maybe not to replace every weapon in a squad with a new caliber.
I guess if they can agree to a medium caliber (the 6.5mm seems to get the most praises for its stopping power and better long-range capability than the 6.8mm) and use that one round, that would be the best interim solution. Change the weapon so that most squad members have a 6.5mm carbine (a couple with an attached grenade launcher), one or two would have the long barrel 6.5mm version of the rifle for sniping, and one or two carry a 6.5mm SAW version with a heavier barrel, higher capacity magazine and bipod.
Although the money spent for such a temporary fix (of developing a new 6.5mm weapon system) would probably still be better invested in developing the true next generation weapon with greatly increased performance and lethality. They need to use the XM-25 concept but scale it down to fire mini-guided rounds. The rounds would be bigger than what is currently used in an assault rifle but still small enough to be portable and accurate where each round fired would almost be assured a devastating hit up to at least 600m (optimally to 1000m).
-----JT-----