The .50 BMG is still the undisputed KING for a round that will go through-and-through multiple bodies. Having a trained sniper with a scoped Barrett overlooking the field of battle is like having a warm, fuzzy security blanket ... kind of like hearing "BRRRRRRRRRT" overhead ...
However, this would give a member of the squad a little extra heft in a normal-sized rifle. The range results said it was devastating against light vehicles, so I imagine it will punch through concrete block to get at anyone hiding behind it.
The essential American soul is hard, isolate, stoic, and a killer. It has never yet melted. ~ D.H. Lawrence