Refab60, your Luger has been rechambered in 9x21mm. I assume it's because Italy doesn't allow civilians to own 9x19mm pistols. It has clearly gone through an Italian proof house as the proof marks show.
In general, Lugers are very accurate so I don't know why yours is not. Have you tried shooting it from a rest to eliminate human error? Lugers made in 1918 would have been zeroed at 50 meters with a 123 grain bullet at approximately 332 meters per second.
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