Agreed, I'm not sure I see the .338 doing the job of the .50...
Still, the MG338 fires .338 and weighs seven pounds less than the M240...color me intrigued.
https://www.youtube.com/watch?v=sl3qfdvFmig
In any case, SIG now manufactures nearly the entire range of small arms for the infantry platoon - sidearms (M17/M18), rifles (XM5), automatic rifles/squad automatic weapons (XM250), the corresponding ammunition (9mm and 6.8mm), and suppressors. And they're well situated to capture additional contracts. It's an impressive accomplishment.