RAY1946:
Here are some answers to a few of your questions above.
Groove diameters are very standard on Lugers. My 1917 DWM and 1941 Mauser are both in spec. at 9.1mm or .358 inches.
Because I have "vintage year" Lugers, the chambers are stepped. When you look at a fired casing, you will see this little step. This was designed into the chamber to aid in sealing the case to the chamber wall upon firing.
I bought 10,000 of the RCBS 124 gr TC at an estate sale (back in the day) on ebay. They were dirt cheap and were a real quality casting out of what appears to be linotype. The diameter is at .356 and they are lubed with the standard NRA formula of 50/50 beeswax and alox. The key to an accurate bullet with these (as well as most cast bullets) are square and true bases.
Please let me know how you are progressing.
Sieger
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