User blog comment:DarkSamuraiX1999/New Details on Aftermath/@comment-4951752-20120727162122/@comment-1990578-20120731172735

So far, .338 Lapua Magnum is the largest handheld weapon caliber. As much clamor for a return of the M95 in .50 BMG, DICE stated it won't happen because it's either balance the weapon to make it not perform like the round really would, or make it OP as fuck (like the campaign's M82A3 doing 100 damage AT ALL RANGES no matter where it hits).

The game's damage system just won't let it fit in, and that's why we have the M98B. Not only beacause of this, but because there's talks of the Marines adopting it as their long-range sniper of choice IRL, so it fills the gap quite well while sticking somewhat to realism.