Projectile

A projectile including an ejectable cup intended to protect, during firing, a base of the projectile with respect to propulsion gases, the cup including a bottom located at a rear of the projectile and a wall surrounding the base and extending longitudinally to a position where an edge of the wall is pinched between a seal surrounding a body of the projectile and a collar also surrounding the projectile, the collar comprising an annular part centered on a first cylindrical seat of the body of the projectile, the first cylindrical seat having a first diameter, the collar being located behind a rotating band of the projectile that is centered on a second cylindrical seat of the body of the projectile, the second cylindrical seat having a second diameter, wherein the first cylindrical seat is separated from the second cylindrical seat by a shoulder, a face of which is oriented toward the rear of the projectile, a means for gripping pressing the seal against the annular part of the collar, which causes a radial expansion of the seal, which is thus pressed against the edge of the cup, which is in turn pressed against an inside of the collar.