First Breach Precision Series .223 Remington 55 Grain Full Metal Jacket Boat Tail 220 Brass Case Rifle Ammo 1000 Rounds. 223 REM FMJ 55 grain match-grade ammunition. FB USA .223REM Headstamp. Specifications for First Breach Precision Series .223 Remington 55 Grain Full Metal Jacket Boat Tail 220 Brass Case Rifle Ammunition: Manufacturer: First Breach Caliber: .223 Remington Number of Rounds: 1000 Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 grain Cartridge Case Material: Brass Muzzle Velocity: 3100 ft/s Package Type: Box Primer Style: Centerfire Package Contents: First Breach Precision Series .223 Remington 55 Grain Full Metal Jacket Boat Tail 220 Brass Case Rifle Ammunition Loose rounds in sealed packaging First Breach 50005: Precision Series .223 Remington 55 Grain Full Metal Jacket Boat Tail 220 Brass Case Rifle Ammo 1000 Rounds