X-Treme Bullets Pistol Bullets .355 Caliber 147 Grain Round Nose 500 Bullets 500 9. 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. Package Contents: X-Treme Bullets Pistol Bullets .355 Caliber 147 Grain Round Nose X-Treme Bullets XB9R147357B500: Pistol Bullets .355 Caliber 147 Grain Round Nose 500 Bullets 500