Internet lore and gunshop wisdom generally has it that the CZ-52, which was the host gun for the gelatin and velocity tests, is designed to operate at high cartridge pressure - but has no significant factor of safety. If this is true, it implies that increased caution must be used when developing loads for this cartridge/gun combination, as a slight overpressurization of the chamber may result in catastrophic failure of the barrel and gun. Couple this with the small amount of free volume inside the case (when loaded with a maximum charge of H110 powder) and my desire to increase the bullet seating depth in order to utilize the cannelure of the XTP bullets, choosing a safe pressure at which to start the load development, is very hit or miss. The picture above about sums up what I must have looked like pulling the trigger on the CZ the first couple of times! Hornady 85gr XTP (resized to 0.309" diameter) Recorded at unknown velocity (chronograph read 3313 ft/sec). Load used 14.3gr of H110, CCI Small pistol primer, COAL = 1.320". Hornady 90gr XTP 1512 ft/sec (single round chronographed). Load used 14.2gr of H110, CCI Small pistol primer, COAL = 1.320". Hornady 100gr XTP (resized to 0.309" diameter) Chronographed at 1551 ft/sec (single round). Load used 13.9gr of H110, CCI Small pistol primer, COAL = 1.320". S&B 85gr FMJ 1612 ft/sec, 1531 ft/sec, 1523 ft/sec, 1493 ft/sec, 1517 ft/sec NGA (New Generation Ammunition) 86gr FMJ 1477 ft/sec, 1464 ft/sec, 1459 ft/sec, 1479 ft/sec, 1458 ft/sec Norinco (marked 'non-corrosive' on a yellow box) unknown weight, FMJ 1517 ft/sec, 1490 ft/sec, 1518 ft/sec, 1514 ft/sec, 1508 ft/sec Chinese-looking box (perhaps fell off a PLA truck, not sure where it's from) unknown weight, FMJ 1507 ft/sec, 1465 ft/sec, 1499 ft/sec, 1496 ft/sec, 1494 ft/sec