Notice the bolded word inthe Frag-12 discription below:
"According to the U.S. Marine Corps Warfighting Laboratory's (MCWL) FRAG-12 Shotgun Ammunition Fact Sheet (PDF file), all three FRAG-12 rounds utilize a standard 3-inch 12-gauge cartridge case and propellant, which fires a fin-stabilized 19mm warhead with a MIL-SPEC 1316-compliant fuze assembly. The projectile arms after firing once it reaches 3 meters from the muzzle, and detonates on impact with the target. The FRAG-12 HE projectile, for instance, is designed to punch a one-inch diameter hole through 1/4-inch cold rolled steel plate, have a maximum effective range of 200 meters (200m), and reliably cycle/function in both gas-operated and recoil-operated tactical/combat shotguns. 200m is an impressive effective range for a 12-gauge tactical shotgun employed/deployed in infantry combat/urban warfare environments. The FRAG-12 HE-AP round incorporates a shaped charge to allow it to penetrate 1/2-inch steel armor plate. The Marine Corps Warfighting Laboratory (MCWL) states that "the main reason for experimentation [with the FRAG-12 ammo family] is to examine these rounds as potential improvements to the combat-effectiveness of shotguns in urban areas [for urban warfare operations], using shotguns for stopping vehicles [vehicle interdiction] at roadblocks and checkpoints, barricade attack, and remote probing of potential Improvised Explosive Devices (IEDs)."
1" hole in 1/4 plate steel at 200 yards ... damn
