18x152

18x152 refers to a specific size designation, commonly found in the context of ammunition. The "18" typically denotes the caliber of the projectile in millimeters, indicating its diameter. The "152" refers to the length of the cartridge case, also measured in millimeters. Therefore, 18x152 describes a cartridge with an 18mm projectile and a 152mm case.

This particular designation is not a widely common or standardized ammunition type in modern military or civilian use. It is more likely to be encountered in historical contexts, experimental designs, or specialized applications. The ballistics and performance characteristics of an 18x152 round would depend heavily on the specific projectile design, propellant used, and the firearm it is intended for. Without further context or a specific firearm model associated with this designation, detailed specifications are difficult to ascertain. It is important to note that ammunition designations can vary between manufacturers and regions, and this specific size may have had different names or applications historically.