The Swiss tested several DWM lugers in 9mm in the early years, especially the 1902 model. Also, they re-tested the model 1929 (from Waffenfabrik Bern) in 9mm, very few being seen, and questioned by some purest collectors. In spite of all this, the Swiss, at least with the Luger, NEVER officially adopted the 9mm cartridge. My guess is that the 7.65mm round functioned more efficiently with the toggle mechanism.
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