27×105

27x105 is a designation for a type of artillery ammunition. The first number, 27, refers to the approximate diameter of the projectile in millimeters. The second number, 105, typically indicates the length of the projectile in millimeters as well, though in some contexts it can refer to the caliber of the gun it is designed to be fired from. Ammunition designated as 27x105 is not a widely standardized or commonly encountered cartridge, especially when compared to more prevalent artillery calibers like 105mm or 155mm.

Its specific military or historical usage is not extensively documented in public records, suggesting it may have been a specialized or experimental round, or perhaps used in a less common or older weapon system. The combination of a 27mm projectile with a 105mm casing length would imply a relatively long and slender projectile for its diameter, potentially designed for specific aerodynamic properties or penetration capabilities. Without further context or the identification of a specific weapon system that utilizes this ammunition, detailed information about its performance characteristics, intended targets, or operational history remains limited. It is possible that this designation refers to a non-military application, though artillery nomenclature usually implies military use.