Perhaps the case needs full length sizing dies? Does the brass need trimming after the first resizing? If the brass was properly sized, is there dirt in the Luger's chamber?
Crimp should not normally change OAL unless the die is set to push down too far.
Measure OAL, and Mouth to Case Head distance on reloaded cartridges. I have a standardized chamber gauge tool for testing every cartridge I reload.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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