Originally Luger magazines were stamped from two sheets of thin steel, bent to shape, and fold-and-crimped together. The feed lips thus formed lost strength over the long term. In 1938 the Haenel-Schmeisser Co. patented a method whereby a steel mandrel shaped as the inside of the magazine was made; a sheet of steel was formed around this, the ends butted together at the spine and welded. The outside configuration was machined. These eventually went into service as the standard Luger magazine, and continued in production in East Germany until the mid-1950s. They are excellent shooting magazines.
Magazines of this pattern are often, erroneously, referred to as extruded.
You are correct about the .30 Luger (7,65mm) functioning, it is the cartridge for which the Luger was actually designed--they were developed together.
--Dwight
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