a cartridge magazine including a spiral channel having a tangential linearxit section , a plurality of spider arms dividing the cartridges into groups of cartridges and having a plurality of indentures in their radial faces , and a drive means mounted external to the magazine for driving said arms . the spiral is a perfect archimedian spiral and the indentures on an arm number one less than the number of cartridges in a group and are displaced radially by the diameter of a cartridge .