The invention relates to a protective cover which is intended for sporting rifles that comprise screws (2) which are used to fix a shell propulsion mechanism (3) to a rifle support (4). The invention is characterised in that the dimensions of the cover (5) are pre-determined as a function of the area to be covered, said area to be covered including the heads (1) of the screws (2) which are used to fix the shell propulsion mechanism (3) to the support (4). The invention is further characterised in that it comprises means for fixing the cover to the sporting rifle.