A projectile for firing out of a barrel of a weapon, the barrel having an inner diameter, the projectile comprising: a substantially cylindrical projectile body with first and second axially opposite ends (614, 616) and a cavity defined between the first end and the second end for holding a quantity of propellant; the cylindrical body having a first outer diameter, the first end being closed and formed with a nose and the second end being open; two seals extending about an outer circumferential surface of the body, each seal protruding radially from the body to form a substantial seal against an inner circumferential surface of the barrel when the projectile is fired, each seal having a second outer diameter greater than the first outer diameter; the nose being rounded or in the shape of a conical frustum; a case in which the projectile is received, the case comprising a tube sealed at one end by a base and open at an opposite end, wherein the first end of the cylindrical body protrudes from the open end of the case; wherein the two seals comprise a first seal formed adjacent the second end of the cylindrical body and a second seal formed near the first end of the cylindrical body adjacent the nose, wherein the second seal is at least partially covered by the tube, the projectile being characterized in that the case is fitted over a portion of the cylindrical body with the base being adjacent the second end of the cylindrical body and closing the cavity wherein said quantity of propellant is retained by the base, and in that the tube has a cylindrical wall of constant inner diameter for a section extending between mutually adjacent edges of the first and second seals. a substantially cylindrical projectile body with first and second axially opposite ends (614, 616) and a cavity defined between the first end and the second end for holding a quantity of propellant; the cylindrical body having a first outer diameter, the first end being closed and formed with a nose and the second end being open; two seals extending about an outer circumferential surface of the body, each seal protruding radially from the body to form a substantial seal against an inner circumferential surface of the barrel when the projectile is fired, each seal having a second outer diameter greater than the first outer diameter; the nose being rounded or in the shape of a conical frustum; a case in which the projectile is received, the case comprising a tube sealed at one end by a base and open at an opposite end, wherein the first end of the cylindrical body protrudes from the open end of the case; wherein the two seals comprise a first seal formed adjacent the second end of the cylindrical body and a second seal formed near the first end of the cylindrical body adjacent the nose, wherein the second seal is at least partially covered by the tube, the projectile being characterized in that the case is fitted over a portion of the cylindrical body with the base being adjacent the second end of the cylindrical body and closing the cavity wherein said quantity of propellant is retained by the base, and in that the tube has a cylindrical wall of constant inner diameter for a section extending between mutually adjacent edges of the first and second seals.