Don't know. You didn't say whose bullet it is? Most will be about the same in the same weight class, but exceptions occur for shapes that seat more deeply into the case. Usually powders a little slower than 231 are used because they produce more velocity for the same peak pressure. Go to Hodgdon.com and use the first link to enter the load data sight. After you get into the metalic cartridge data portion of the site, select 231 from the list and 125 gr for the bullet weight and 9 mm Luger for the cartridge then hit the Get Data button. You get a couple of loads for different shapes and lengths. I believe your data is in the ballpark. 3.9 grains seems to be a starting load.
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