Get a cartridge gauge. these are generally designed to show you the maximum correct cartridge overall size and length. As you reload a cartridge, do 100 percent testing of your output with these drop in gauges.
If you want to check the cycling of your Luger, make dummy rounds.
You may want to fill your dummy round have something in the primer hole so that the firing pin had something to stop it. just make sure that the dummy rounds are properly drilled through the case and marked by painting with black lacquer.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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