Lehigh Controlled Fracturing lead free bullets are designed to deliver maximum terminal performance. Controlled Fracturing bullets are pre-stressed at specific points so that after a predetermined penetration depth, the razor-edge petals deploy, releasing an energy spike and then separate and radiate outward from the primary path of the bullet. The bullet shank, now back to bore diameter, continues penetrating straight and deep along the initial impact path. Unlike traditional expanding bullets which mushroom and dramatically limit the bullet's penetration and provide only one wound path.