The invention relates to a shotgun cartridge case and to a shotgun cartridge made therefrom. The case is made in one piece from injection-moulded plastic material and has a cylindrical wall and a base portion with a central opening for a primer. A set of peripherally situated heels (18) is attained by means of grooves extending from the end plane of the base portion, preferably a pair of concentric circular grooves (13, 14) and radial grooves (15) connecting the circular grooves, which grooves have a substantial extension in the axial direction of the case, preferably at least about 2/3 of the minimum axial material thickness of the base portion. These heels absorb the powder charge gas pressure and execute a translatory displacement in the axial direction of the case without the primer hole being deformed, whereby leakage of powder charge gases through the primer hole and displacement of the primer itself are avoided. In one embodiment, the primer opening is enlarged at its region connecting to the powder charge chamber and forms a cavity for receiving an adhesive means in the form of a collar adhered to the primer, thereby providing further insurance against displacement of the primer due to the powder charge gases.