Cartridge : Barnes 62gr Triple-Shock (handloaded). Firearm : Gas-operated rifle with 16" barrel length and 1/9 inch rifling twist. Block calibration : All depths corrected (From 9.5cm @ 578 ft/sec (primary block) and 8.3cm @ 585 ft/sec (stopper block)) Penetration = 17.4" Average expanded diameter = 0.408" Impact velocity = 2752 ft/sec Load was a handloaded round, utilizing 25.5 grains of Winchester 748 powder, Winchester .223REM cases and using CCI small rifle primers. A heavy crimp was placed on the case at the final annular groove on the bullet. Gelatin piece placed on top of block was not removed as a result of bullet penetration.