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 AR-15 with 20.0" barrel length Block calibration : All depths corrected (From 10.7cm @ 627 ft/sec) Single shot fired from a distance of 10'. Impacted initial block at 2663 ft/sec, penetrated to 7.1" of gelatin and through the interior wall. Bullet then struck the stopper block, penetrating to 7.1" of gelatin and ~3" of bunched polyester fiber. Bullet recovered at 0.502" average diameter and 110gr weight. Interestingly, the interior wall appeared to have no significant effect on this particular bullet - on both the bare block and the stopper block, the bullet appeared to enter 'non-cavitating flow' (IE it is going slow enough, for it's particular shape/size, not to make significant turbulence in the gelatin) at the same depth, indicating approximately the same velocity at the same depth in either block. The 'Legal Liability' gelatin block (placed behind the wall to simulate an uninvolved third party):