Special thanks to J.K. for funding this test in full. Cartridge : Federal 105gr Expanding Full Metal Jacket Firearm : Recoil-operated handgun with 4.0" barrel length Block calibration : All depths corrected (From 9.2cm @ 578 ft/sec (bare gelatin shot) and 8.6cm @ 588 ft/sec (denim and overpenetration shot)) All shots fired at 10 feet distance from muzzle to the front face of the gelatin block. Shot 1 - Bare gelatin shot. Impacted at 1169 ft/sec, penetrated to 9.3". Bullet was recovered at 0.584" average diameter and 103.4gr weight. Shot 2 - Heavy clothing shot. Impacted at 1150 ft/sec, penetrated to 8.8". Bullet was recovered at 0.580" average diameter and 104.9gr weight. Shot 3 - Overpenetration shot. A 16" pistol block is cut roughly in half, with one half placed in front of an interior wall and the other half placed behind the interior wall. This simulates the effect of a bullet that overpenetrates a thin portion of a target and then assesses the potential danger to persons on the other side of the wall. Bullet impacted at 1148 ft/sec, penetrated to 6.9" in the initial block, completely through the interior wall and was found at the base of the second block, having inflicted no damage to the secondary gelatin block. Recovered at 0.591" average diameter and 103.4gr weight.