65G and Future Urban Warfare

[stanc]

The neat thing about the all for one and one for all round is if the designated marksmen is needed burns a lot of ammo with targets the normal riflemen can't engage... if his buddy's rifles fire the same round he has a much greater source of ammo to tap into than just what he can carry on his own.

Certainly. But, that seems to be more of a theoretical concern than a real issue.

From the Vietnam War to the present day, there are any number of stories about the superiority of the 5.56 ammo load vs larger, heavy calibers in combat endurance.

If the squad marksman runs dry, it'd be inconvenient, but probably not critical. If all of the riflemen were to "go black" on ammo, the squad would be in serious trouble.

With 6.5 Grendel, magazine capacity is 17% less than for 5.56mm, ammo is 40% heavier, and so are the magazines.

Either soldier load would have to increase, or combat endurance would have to decrease. Neither option is desirable.