Tinker, orignal ballistik was 665 m/ sec with a 330 grain bullet . I havn’t more informations, there is something in Cotw, you can see it but this book is allmost doubtful as you know.
I dont think that it will be a problem to work up loads for a 330 grain softpoint. There is a new Blaser cartridge: 45 Blaser or metric 11,7x55 Rb with very similar ballistik. I believe 630 m/sec with a 350 grain bullet. Wolfgang Romey desigh this for Blaser and take the .425 WR cases and a .458 bullet. When you know that the .425 WR is a more powerful copy of the 11,2x60 Schueler you will see that there is nothing new under sun. I dont realy like the guns but will contact Blaser or better Wolfgang Romey for .45 blaser reloading data only to get more informations.
Dont have the time now for serios reloading tests, have the .451 230 grain full metall and the .454 300 grain lead bullets and both working good in the home made bullet resizing die. Make a test with kemira N330 and it works fine from the beginning. This is my powder for reloading 9mm Luger and 9mm Steyer.