Robert,
Go by the loading books. Hodgen's book or Lyman's should have something on LRN with various powders.
I use 231, but mainly with revolvers. I've been loading Titegroup for 9mm.
As a general rule, start near the minimum recommended load. If it functions at that level, don't go higher. And, of course, never exceed the max load in the books.
Your Luger looks to be in very good condition. If all matching, and original finish it is likely collectable. Keep in mind that breaking a numbered part considerably impacts it's value (both financial and historic).
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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