Cartridge : Various 9x19mm bullets. Firearm : Recoil-operated handgun with 4.0" barrel length. Calibration : 11.7 ± 0.05cm and 618 ± 0.500 ft/sec impact velocity. Shot 1 - 127gr Winchester Black Talon. Bullet impacted at 1137 ± 0.500 ft/sec. Bullet penetration was 10.4 ± 0.031" (corrected). Expanded diameter was 0.641 ± 0.0005". Shot 2 - 105gr Federal Expanding Full Metal Jacket. Bullet impacted at 1254 ± 0.500 ft/sec, penetrated to 9.6 ± 0.031" (corrected). Expanded diameter was 0.585 ± 0.0005". Shot 3 - 135gr Federal Personal Defense Hydra-Shok. Bullet impacted at 1010 ± 0.500 ft/sec, penetrated to 10.0 ± 0.031" (corrected). Expanded diameter was 0.676 ± 0.0005". Shot 4 - 147gr Federal Hydra-Shok. Bullet impacted at 981 ± 0.500 ft/sec, penetrated to 14.0 ± 0.031" (corrected). Expanded diameter was 0.588 ± 0.0005". 9mm bullets are the upper-rightmost 4 bullets in photo.