Packing for a shell with a case, having between this latter and the front part of the shell a curved part of smaller diameter

A packing for a shell having a case and between the case and the front part of the shell a curved part of smaller diameter, said packing comprising a container made from plastic material having an open end opposite that of the front part of the shell, said open end being adapted to be closed by means of a sealing lid, said container having an inner surface comprising at least one conical part having a conicity directed towards the front part of the shell for limiting the amount the shell is driven into the container when the rear part of the shell is urged forwards by closing of the lid, two molded half-sheaths made from polyureathane, for example, having inner surfaces mating with the outer surfaces of the front of the case and of the rear part of the curved part of smaller diameter of the shell, and a tube fitted over said two half-sheaths and mating with the outer surfaces of said half-sheaths to maintain the half-sheaths in position, said tube having a front part which is conical and middle and rear parts which are cylindrical or conical with a lesser conicity, so that said tube's conical front part bears against said conical part of the inner surface of the container when closing of the lid pushes the rear of the case of the shell forward, said two half-sheaths assuming the exact shape of the outer surfaces of the front part of the case and of the rear part of the curved part of smaller diameter of the shell and the tube which surrounds them.