 This led to the introduction of the Cartridge S.A. Ball .303 inch Cordite Mark III, basically the original 215-grain (13.9 g) bullet with the jacketing cut back to expose the lead in the nose.Similar hollow-point bullets were used in the Mk IV and Mk V loadings, which were put into mass production.The design of the Mk IV hollow-point bullet shifted bullet weight rearwards, improving stability and accuracy over the regular round-nose bullet.