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Old January 26, 2021, 11:16 PM   #8
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 24,310
just by the case drawing & specs in my Hornady book, it won't be a simple or easy conversion. 9mm is the size of the base of a .380 case at the mouth (ok, 0.001" smaller by spec) and TAPERS back to a base that is over 0.02" larger in diameter than the .380 rim.

As mentioned, you'd have to lathe turn each case, and do other things, as well.

Its called 9mm Kurz because it is 9mm caliber and its shorter than the 9mm Parabellum. Its not just the Parabellum case shortened, and it never was. The .380 case is smaller in diameter than the Parabellum, and essentially straight, as well as being shorter. These are not insignificant differences.
All else being equal (and it almost never is) bigger bullets tend to work better.
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