The Roles and Weapons with the Squad

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The correct answer is 7x46. A 175 grain bullet at 2,400 feet per second, or a 120 at 3,000 or even something in between. With a 16 inch barrel.

That seems awfully close to what a 7.62x51 would achieve with a 16" barrel.

The case is smaller than 7.62's as well, which would imply to me that it either runs at a much higher pressure, or is using some kind of special propellant.