New Army "Caliber Configuration Study"

[stanc]

A GPC must be able to match the hit probability of 7.62mm at 1000m...

If 5.56 and 7.62 NATO were to be replaced by a single caliber, as originally envisioned for a GPC, I would agree.

However, if 5.56 will be replaced by one cartridge, and 7.62 by another (as per CLAWS and LDAM), then there is no obvious need for a Squad Common Cartridge to have the same long range capability as would be necessary with a GPC.

...which would be enough for the great majority of missions, even in Afghanistan. I've not heard of any small-arms attacks being launched against ISAF forces from longer ranges than that.

1. I think that's called "planning for the last war."
2. Does the US Army want to match 7.62x54R range, or does it want overmatch?

If a .338 MMG does make it into service, I would expect it to be commonly mounted on vehicles or sited in fixed locations for base defence...

If a .338 MMG weighs no more than a 7.62 MMG, I would expect it to be carried on foot-mobile operations just as the 7.62 MMG currently is. (Although that could change, depending on performance of the squad cartridge.)