Either .30 Luger or 7.65 Parabellum. None of the others is an accurate name for this ammo.
We used to recommend the "pencil test" for caliber. A standard pencil will plunk right down to the bolt face when dropped into a 9 mm barrel. In a .30 Luger barrel, it will be snug or a no-go.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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