X-Treme Bullets Rifle Bullets .223 Caliber 55 Grain Full Metal Jacket 500 Bullets XB223F55B500. 22 caliber 55 grain Full Metal Jacket (FMJ) bullets are proudly made out of the finest materials in order to ensure performance delivered down range with each and every shot. We use state of the art manufacturing technology deigned to encompass the lead core in a copper jacket which is not intended to expand upon impact with the target. A cannelure is added to provide a better hold during the crimp process. These bullets are ideal for target shooting plinking and varmint hunting. Specifications for X-Treme Bullets Rifle Bullets .223 Caliber 55 Grain Full Metal Jacket: Manufacturer: X-Treme Bullets Gun Type: Pistol Bullet Type: Full Metal Jacket (FMJ) Caliber: .223 Remington Cartridge Type: Brass Bullet Weight: 55 grain Projectile Caliber: .223 Caliber Diameter: 0.224 in G1 Ballistic Coefficient: 0.243 Core Material: Lead Jacket Material: Copper Bullet Quantity: 500 Bullet Package Contents: X-Treme Bullets .223 Remington 55 Grain Full Metal Jacket Pistol Ammunition X-Treme Bullets XB223F55B500: Rifle Bullets .223 Caliber 55 Grain Full Metal Jacket