I'm sure you all have the
SAAMI specification for the .30 Luger...
Of course, this wasn't defined when the Luger was made. Initially it was a proprietary cartridge by DWM. Others made it eventually. Very early drawings from the 1910 Kynoch / Eley offering are on page 1469 of Sturgess (red edition).
The SAAMI specs are a little more forgiving than the Eley drawing. The case length on the SAAMI spec is a max of .850 inches tolerance minus .02 inches, while the Eley drawing shows a range of .840 to .850. After the first firing and resizing, it is likely necessary to trim the cartridge case back to this case length.
Remember that the case headspaces on the shoulder.
SAAMI shows a max of 1.175 inches for OAL with a round nose bullet.
The Eley is 1.165 to 1.175 inches OAL.
Interestingly, some of the photos in Sturgess show cartridges with a beveled case mouth...
I'm quite concerned because the case length you mentioned in post 7 would be appropriate for a straight walled .32 Auto cartridge case, and NOT a bottleneck .30 Luger (7.65mm Luger) cartridge case. The .32 Auto is also known as the 7.65mm Browning round. Do you have the right ammo for your gun?