X-Treme Bullets 9mm Caliber Pistol Bullets 124 Grain PN HPCB 500 Bullets. X-Treme Bullets process starts with a lead billet that is extruded into wire. The lead wire is then swaged into a core. The cores are copper plated then restruck once more. Though not common in the industry this restrike process produces a bullet that is more uniform with a more precise diameter and a smoother finish for a better shooting and better looking bullet. Specifications for X-Treme Bullets 9mm Caliber Pistol Bullets 124 Grain PN HPCBs: Manufacturer: X-Treme Bullets Bullet Type: Round Nose Flat Point (RNFP) Caliber: 9mm Luger Cartridge Type: Brass Bullet Weight: 124 grain Diameter: 0.429 in Core Material: Lead Jacket Material: Copper Bullet Quantity: 500 Bullet Package Contents: X-Treme Bullets 9mm Caliber Pistol Bullets 124 Grain PN HPCBs X-Treme Bullets 9mm Caliber Pistol Bullets 124 Grain PN HPCB 500 Bullets