I'm not sure if it would apply to a post war Mauser Luger, but the FAQ PDF document has a copy of the table of spring weights used in Lugers.
Do check out the rear impact on the frame with tape. If your ejection is happening because of weakened recoil, you could end up battering things.
The Luger is a finely balanced firearm. The geometry of the post war Lugers is slightly adjusted from original WW-I and WW-II era pistols. It's possible that Mauser worked to improve performance with more modern SAAMI / CIIP loads. Gerben or Mauro might have documentation?
I shoot my 1937 Mauser Luger shooter outdoors, so don't really know how high they fly - but it's at least ten to 12 feet straight up. "It's raining brass" is one of the experiences...
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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