Abstract: A propulsion cage usually constructed from three segments, intended for a subcaliber projectile is designed so that a surface exposed to the propellant gases is extended preferably in the shape of a truncated cone with the apex toward the rear up to the end of the subcaliber projectile. Force derived from the propellant gases can be transmitted in uniform distribution practically over the entire surface of the subcaliber projectile. At the same time, transmission between the propulsion cage and the subcaliber projectile is enhanced so that the entire propulsion cage can be manufactured from a fiber-reinforced synthetic resin, so that there is no absolute need for providing additional shape-mating transitions between the propulsion cage and the subcaliber projectile, and so that yet a very high propellant gas pressure can be utilized. Preferably, each segment exhibits wedge-shaped cavities open in the firing direction which are filled with cores.