Cartridge : Various .25ACP cartridges Firearm : Beretta 21a with 2.4" barrel length Calibration : 9.4 ± 0.05cm and 593 ± 0.500 ft/sec impact velocity. Shot 1 - Remington UMC 50 gr MC. Impacted at 807 ± 0.500 ft/sec and penetrated to 14.0 ± 0.031". Recovered diameter was 0.250 ± 0.0005". Track outlined in light blue. Shot 2 - Hornady 35 gr XTP JHP. Impacted at 931 ± 0.500 ft/sec and penetrated to 6.7 ± 0.031". Recovered diameter was 0.369 ± 0.0005". Track outlined in yellow. Block had been previously shot with a 45-70 Government cartridge and the damage is visible on the right side of the block as a result of this impact. The .25ACP bullets traveled through an undamaged section of the block.