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Originally Posted by Blasfimus
If I ream the barrel I may be destroying it without knowing for sure what it is.
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A 9mm chambering reamer won't go in a 30 Luger barrel. It just won't. It might go in a 9mm Kurz [.380ACP] barrel, but that would be OK as the bore is still 9mm. I doubt that any barrel maker would make a 9mm Kurz barrel without labeling it as such, and that would be a real oddball caliber for a Luger.
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If someone could maybe send over one or two of .30 brass it would be very much appreciated!
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That won't tell you anything, as a 30 Luger cartridge will just fall in a 9mm chamber roughly as far as the forward end of the extractor groove. About 1/8" farther than a 9mm. If you are still unsure if it is 30 cal, do the pencil trick.
More pictures would be helpful. Any markings, plus side views, overhead, stripped, chamber if you can focus that small, etc.