Cartridge : 53gr Barnes Triple-Shock (handloaded) Firearm : Gas-operated rifle with 16" barrel length and 1/9 inch rifling twist. Block calibration : All depths corrected (From 10.4cm and 596 ft/sec) Penetration = 13.9" Average expanded diameter = 0.419" Impact velocity = 2712 ft/sec Load was a handloaded round, utilizing 25.5 grains of Varget powder, Winchester .223REM cases and using CCI small rifle primers. A light crimp was placed on the case at the final annular groove on the bullet.