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This is a .460 Weatherby Magnum case, shortened tonsiderably, and necked to take a .510 bullet from the .50 Caliber BMG round. The rim on these has been reduced to .532 to be compatible with a standard magnum boltface. The 700 grain (over 1/10th of a pound!) solid bronze bullet is coated with a black molybdenum disulfide layer as a lubricant. This is known colloquially as "moly coating." The bullet is loaded to a velocity of 320 m/s so that it is subsonic, which allows it to be fired silently from a suppressed rifle. Even that slow, the trememdous mass means that it has more energy than a standard 5.56 NATO M-16 rifle. Also, the bullet is very aerodynamic, so it does not lose velocity very quickly, so it is nearly as energetic at 300m as at the muzzle.
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