The middle one is the M855A1 equivalent in .308 for the 7.62x51. The one on the left is the 6.8 analog for the 6.8 cartridge being developed for the next generation squad automatic weapon and assault rifle.
Sig has tried to sway the tests by commercially releasing the .277SigFury cartridge in their chassis bolt action rifle. Obviously the milspec bullet won’t be available for civilian consumers.
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