Abstract: A magazine is provided for storing a plurality of cartridges for processing and provides an operator with a visual indication as to the processing status thereof. The magazine includes a base and a pair of elongated sidewalls which are mounted to the base in a spaced-apart relationship so as to receive the cartridges therebetween. A plurality of shelves are connected between the sidewalls of the magazine at spaced intervals therealong for slidably supporting the cartridges. The magazine sidewalls and shelves form a plurality of receptacles, each receptacle having oppositely located open ends so that each receptacle will accommodate the travel of a cartridge therethrough as the cartridge slides on the shelf. First and second stop devices are mounted within each receptacle for stopping travel of a cartridge through the receptacle at first and second positions therealong.