In combination with the BR55 Battle Rifle, this round is accurate enough that the 2x scope on the Battle Rifle is useful. Even when fired in three-shot bursts, the round produces little recoil resulting in very little muzzle lift; it is more effective against both shielded and unshielded personnel than the 7.62x51mm NATO. Overall, the M634 Experimental High-Powered Semi-Armor-Piercing round provides good accuracy, controllability, and effectiveness.
However, while the M634 X-HP-SAP does do more damage than the 7.62x51mm NATO against vehicles, it is still not a very effective round at damaging or stopping vehicles.
As designated in its name, the M634 X-HP-SAP is an experimental round. It uses a special propellant that allows it to achieve a higher muzzle velocity than the 7.62x51mm NATO while using a smaller cartridge. It is also semi-armor-piercing, meaning that it mixes the properties of an armor-piercing round with the properties of another type of round.