The .277 Fury is an interesting cartridge. Since the full power cartridge is a steel/brass hybrid, I am not quite sure it's economical for me to reload. However, since it goes up to 80k psi, I am not sure I would even want to reload that brass.
Still, a 135gr bullet traveling at 3k ft/s is no joke. I am super curious to see how body armor holds up.
True the MG is the star of the NGSW show. I could see the rifle being a dmr style role in a squad. Hits harder, reaches farther but it isn't given to everyone.
The reason the m4 is a smaller cartridge is that its predecessor had serious over penetration issues. Ideally the bullet will stop inside of the victim.
The XM7 will have seriously worse performance due to over penetration and other ballistics, not to mention heavy and limited ammo. Maybe it will fare better against armor, which would be good in a hypothetical matchup with a comparable enemy, but that is unlikely to occur any time soon.
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