At the Lewiston, Idaho, Speer facility large spools of gilding-metal jacket material are unwound in the initial phase of bullet manufacture. Circles of specific size are cut from the material to form jackets, and the excess is rewound and sold.
Jacket manufacturing occurs in multiple steps. In the first image the extruded jackets are in an early stage, as evident in their shallow, bowl-like shape. Additional processing elongates the jackets to necessary length.
Speer’s Hot-Cor, Mag-Tip and Grand Slam bullets have the lead-alloy core added via the Hot-Cor process, in which the molten metal is poured directly into the jacket. The process helps prevent jacket-core separation.