The XM5 and 6.8×51 Ammunition Will Be a Decisive Advantage. U.S. Allies Should Adopt It, Too

By Jennifer Sensiba

In yesterday’s press conference announcing SIG SAUER’s victory in the Next Generation Squad Weapon competition, Army officials said America’s likely future adversaries were a key factor in the final choice. The XM5 (a variant of the SIG MCX) and the XM250 machine gun run the recently-developed 277 SIG FURY hybrid steel/brass cartridge. It’s some spicy stuff.
The round’s 80,000 psi pressure can push a 135-grain bullet to velocities of 3,000 feet per second.
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Source: The Truth About Guns