Liberty Ammunition LAR90662: Liberty Ammunition Steel Plate & Range is designed to increase safety and minimize the environmental concerns from lead. The ammunition is loaded with SinterFire projectiles. Liberty Steel Plate & Range ammunition features lead-free bullets that crumble into very small pieces when they hit a metal backstop. These precision-formed bullets are made of sintered powdered copper thats compressed under heat and pressure to form a bullet. Sintered technology means theres no separate jacket that can produce sharp fragments on impact.