AMMUNITION CARTRIDGE

A multi-part casing for an ammunition cartridge comprising a tubular sleeve and a base, the base assembled and fixed to the tubular sleeve by a weld arrangement. The base comprises an end wall (8) having a rim (7), an extraction groove (6) adjacent the rim (7), and a tubular extension (11) extending from the end wall and having an outer surface (13) in contact with an inner surface (12) of a base end (10) of the tubular sleeve (3). The welding arrangement comprises a weld line (9) that spirals around the base end of the tubular sleeve from a weld line start point (15) positioned over the tubular extension of the base spiraling to a weld line end section positioned over the extraction groove (6), a surface portion of the extraction groove interfacing with the tubular sleeve having a machined surface such that the weld line ends in the machined surface.