Cartridge : Federal Premium 60gr Partition (Load # P223Q) Firearm : Gas-operated rifle with 16" barrel length and 1/9" twist Block calibration : All depths corrected (From 8.7cm and 591 ft/sec) Penetration was 15.9" + (bullet traveled out of back of block) Average expanded diameter = 0.375" Impact velocity = 2894 ft/sec Bullet was tested in compliance with International Wound Ballistic Association 'heavy clothing' test. Test media was covered in 4 loosely-layered pieces of 12.5 ounce denim fabric. Bullet perforated entire 16" block and knocked polyester bullet arresting box off of test stand on bullet exit.