By the looks of your case, this particular ammo seems a bit too strong for your pistol; I would check the chamber, and have it cleaned properly; I don't think it's your extractor. I often go to the range, sometimes also with one of my Lugers, I reload my 9 mm, so far never had any problems.
I also agree that any normal modern case should fit your chamber quite well. I would't allow the first "Gunsmith" down the road to fiddle with my precious Luger for "adjustments" of a design that was already perfect upon conception more than a century ago.
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"Originality can't be restored and should be at the top of any collector's priority list.
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