Thread: Lines in case
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Old July 18, 2012, 06:16 PM   #3
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Join Date: December 24, 2008
Location: Loveland, CO
Posts: 1,475
The 9mm you are interested in is described here to help differentiate it from the 9 X 18 Makarov round and the 9 X 21 round.

9mm Luger, Parabellum, 9mm etc. are all the same designation but come from different origins.

The mark on the case is basically a ring to assist the case in resisting setback as the round slams into the feedramp during the chambering action.
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