Firearm : CZ-52 with 4.6" barrel length Ammunition : Three handloaded Hornady XTP bullets of various weights, loaded to tabulated maximum pressure Block calibration : 590 ft/sec and 8.7cm penetration Shot 1 - Hornady 85gr XTP, resized to 0.309" diameter. Impacted at unknown velocity (chronograph read 3313 ft/sec). Penetrated to 11.5" and was recovered at 0.510" average diameter. Load used 14.3gr of H110, CCI Small pistol primer, COAL = 1.320". Shot 2 - Hornady 90gr XTP. Impacted at 1512 ft/sec and penetrated to 12.3". Bullet was recovered at 0.498" average diameter. Load used 14.2gr of H110, CCI Small pistol primer, COAL = 1.320". Track outlined in magenta. Shot 3 - Hornady 100gr XTP. Impacted at 1551 ft/sec and penetrated to 13.9". Bullet was recovered at 0.501" average diameter. Load used 13.9gr of H110, CCI Small pistol primer, COAL = 1.320". The 85gr and 100gr bullets came from Hornady at 0.311" diameter, while the 'proper' bullet diameter for this cartridge is 0.309". While two one-thousands of an inch is not that much, I was not anxious to pull the trigger on the cartridges with these bullets loaded in them - because they would not cycle/chamber freely in the tested CZ-52. A Lee lead bullet sizing die for 0.309" bullets was used to size the bullets down to 0.309". It's my understanding that the CZ-52 can handle hotter loads than some of the other Com-Bloc pistols chambered for 7.62x25mm Tokarev. While I don't shoot these pistols regularly and it may be Internet lore, please approach these maximum loads with caution in your firearm.