Okay, I should have researched more before I posted here.
I believe it is normal for a Luger to eject brass like that. I've found a few other threads on the net saying the very same thing.
The ammo was probably 15 year old gunshow ball ammo I had laying around and commercial reloads too so I doubt it was loaded hot, but who knows.
I'll take the Luger apart soon and compare the existing mainspring with the new Wolff I have.
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