In fact, guns do not work that way. Fictional BNT-35 automatic rifle is presented as one of a kind high-caliber weapon that somehow uses cartridges, that have no markings and are absolutely unknown to experts.
There is a reason why most automatic rifles and machine guns have a cyclic rate of fire of about 600-800 rounds per minute (to ensure the balance between controllability, volume of fire and ammo consumption). Nobody will design a military rifle with the rate of fire of an anti-aircraft gun.
However, the real .308 Winchester battle rifle would do much similar damage. It is used by the military.