Cartridge of a firearm, cartridge chamber, combination consisting of a lock and cartridge chamber of such a cartridge, and firearm

A cartridge of a firearm comprising a cartridge case implemented in the manner of a bottleneck cartridge case for receiving a projectile, wherein the cartridge case has an overall length of 38.50 mm (1.5157″) to 40.50 mm (1.5945″), wherein the length from the bottom to the transition from a shoulder cone to case neck is 32.29 mm (1.2713″) to 33.29 mm (1.3106″),

• wherein the length of the case neck is selected such that the ratio of the diameter of the projectile to the case neck length of the cartridge case is between 1.26 and 1.36, and
• wherein the shoulder cone connects to the case neck and transitions into the case body of the cartridge case,
• wherein the case body connects to an extractor groove of the cartridge at the case bottom and has a conical taper from the extractor groove toward the shoulder cone, such that the case body has a diameter of 10.07 mm (0.3965″) to 11.350 mm (0.4469″) at the connection to the shoulder cone, and
• wherein the cartridge, when employed in weapons systems, demonstrates unilateral backward capability.