David,
Lugers were not designed for steel cases, as they were designed with a stepped chamber (for one thing).
In fact, only brass cased ammo marked "Nur fur Pistole 08", "for P-08 pistols only" was so marked and issued by the Germans throughout WWII.
Coupled with, no doubt, overloaded velocity; this ammo could cause you some real mechanical problems, if shot through a Luger regularly.
I'd save this ammo for a more modern 9mm pistol.
Sieger
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