Special thanks to grimjaw for funding this test in full. Cartridge : 148gr Czech FMJ (silver painted tip) Firearm : M44 Mosin-Nagant carbine with 20.5" barrel length Block calibration : 8.8cm @ 579 ft/sec (Within ideal block tolerances) Single shot fired at 10' distance. Impacted block at 2676 ft/sec, penetrated nose-forward to 5.6", at which point the bullet turned on its side. The bullet continued on in this orientation until 10.0" depth, when it righted itself and continued to travel axially out of the rear of the block at 16.0" depth. Bullet was not recovered. The bullets path through the block deviated significantly from the initial line of impact, due to yawing. This yawing also spun the block ~ 180 degrees - the initial line of impact of the bullet was almost centered on the block... at the time of significant yawing (energy/momentum transfer), the bullet had traveled off to one side of the center of the block, thus creating a torque on the block and spinning it like a rag doll.