Special thanks to J.K. for sponsoring this test in full. Cartridge : 110gr Barnes Triple-Shock X-Bullet (Silver State Armory) Firearm : 6.8mm SPC gas-operated rifle with 20.0" barrel length Block calibration : All depths corrected (From 10.4cm @ 618 ft/sec) Single shot fired from a distance of 10'. Gelatin block was faced with 4 loosely-layered pieces of 14.1 ounce denim fabric to simulate heavy winter clothing. Bullet impacted block at 2639 ft/sec, penetrated to 15.3" of gelatin and 8" of bunched polyester fiber. Bullet recovered at 0.521" average diameter and 109.7gr weight.