You've also discovered one reason that a special DWM load was designed for the Luger Carbine...
It would be possible to adapt loads to the longer barrels. Slower burning powder would do the trick.
In order to proceed, you'd need an instrumented barrel to ensure that what you load is safe. Both too little and too much powder can cause overpressure.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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