40×51 mm MV (medium velocity),also known as 40×51 mm extended range low pressure (ERLP),is a NATO-standard high–low grenade launcher cartridge meant for hand-held grenade launchers. Its purpose is to be an intermediate cartridge between the 40×46 mm low-velocity and 40×53 mm high-velocity cartridges and is thus referred to as 40 mm medium velocity.
The propellant has medium pressure and gives the projectile an average velocity of 100 m/s (328 ft/s) depending on the ammunition type. It has a maximum range of 800 meters, exceeding conventional extended range low-velocity variants by up to 375 meters
40x53 mm Round with High Explosive Dual Purpose Grenade
The 40×53 mm Round is intended to destroy enemy manpower, transport means and light-armoured objects at distance of up to 2200 m. It is also capable of destroying enemy personnel located in long-term emplacements, long-term camouflaged emplacements, bunkers, dugouts and buildings.
The rounds are designed to be fired from Automatic Grenade launchers, as follows: GD/SACO Mk19, HK GMG, SB LAG40, and other Automatic Grenade Launchers, compatible with 40×53 mm High velocity Rounds, meeting NATO requirements.