A combustible propellant charge casing for ammunition which can be shot from the barrel of a weapon. So that the erosion-reducing additive will lead to a decrease in the erosive action of the propellant powder present in the molded part of the ammunition better than that of known additives, either polyacetylene or a mixture of WO.sub.3 and MoO.sub.3 and CeO.sub.2 or La.sub.2O.sub.3 or Y.sub.2O.sub.3 is used as the erosion-reducing additive. The particle size of the erosion-reducing additive does not exceed 30 .mu.m, and the specific surface area of the erosion-reducing additive is at least 2 m.sup.2/g. The mixture can also contain polyoxymethylene (POM).