Abstract: A blank or live ammunition cartridge suitable for rifles or guns and including a cartridge case made of a plastics material and comprising a metal bottom insert; the metal bottom insert is part of an integral element comprising said bottom insert firmly anchored in a plastics sleeve, said integral element being inserted into the lower or bottom end of the cartridge case.A method for manufacturing an ammunition cartridge by forming a metal bottom insert from a metal sheet by deep-drawing; combining said metal bottom insert with a plastics sleeve so as to produce an integral structure; and inserting such integral structure into the bottom end of a plastics cartridge case.