The .308 is probably the most type of ammo. It's consistent and not punishing to shoot. While it may over penetrate, the .308 is used by a lot of law enforcement and military personnel. It's effective range is about 800 meters and a muzzle velocity of approximately 2,800 fps.Click here for some more information on the .308 round, page by Hitach Industries, Inc.
Military Designation: XM993
The 7.62AP will penetrate 15mm of armour at 300 meters. It will also penetrate 120mm plexiglass helicopter protection. It is good on brick and concrete walls and causes no barrel wear.
Military Designation: M948
They function in most 7.62mm rifles and also 7.62 bolt action rifles, M240 Coax or Pedestal mounted configuration, the M134 Gatling Gun and the M60.
Military Designation: M118
Specially prepared for weapons designated as competition and sniper.