Simple:
Old design from 1902 to around 1940 has a different shape than modern 9mm Para.
Chamber is not totally conical, you have a 5mm strait bore just after the beginning of riffling.
Picture:
http://forum.lugerforum.com/lfupload/image2reduced.jpg
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Swiss Lugers, (.30): DWM 1900, 1906 2nd variation, W+F 1906-24, 1929 Privat, 1929 Military, 9 mm 1929 Military.
WW1 DWM German Lugers (9mm): Lange Pistolen P08-14 1916 & 1917, P08 1913, P08-14 1917, Navy P1904 altered safety, Navy P04-1906 downward safety.
WW 2 Mauser German Lugers (9mm): 42-1940, byf 41, byf 42 black widow. And some other things...
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