Cartridge : Federal 36 grain (Load # 745) Firearm : Ruger 10/22 rifle with 18.5" barrel length. Calibration : All depths are corrected (from 9.3cm @ 575 ft/sec and 10.0cm @ 587 ft/sec impact velocity (Shot 7)). Average diameter for shots 1-6 was 0.281". Average impact velocity was 1217 ft/sec. Shot one - Penetrated to 14.3" in the block and was found on the ground, ~4' behind the block. Shot two - Penetrated to 12.9" into the block. Shot three - Penetrated to 13.9" into the block. Shot four - Penetrated four layers of light denim fabric and 12.3" into the block. Shot five - Penetrated four layers of light denim fabric and 12.9" into the block. Shot six - Penetrated four layers of light denim fabric and 10.8" into the block. Shot seven - Penetrated to 13.3" with expanded diameter of 0.308". Talk with other shooters about this test on The High Road.org : www.thehighroad.org