Cartridge : Federal 240 grain Hydra-Shok (part #P44HS1) Firearm : 44 Magnum revolver with 4" barrel length. Calibration : 10.0 ± 0.05cm and 591 ± 0.500 ft/sec impact velocity. Shot impacted at 1171 ± 0.500 ft/sec. Bullet penetrated 16.0 ± 0.031" of gelatin block and ~4" into a polyester bullet arresting box. Expanded diameter was 0.566 ± 0.0005" with heavy bullet fragments found along the track of the bullet and three pieces of lead were found along with the main bullet section in the bullet arresting box.