I've been using 4.4 grains of 231 and 180 grain lead bullets. Very comfortable to shoot which is what I wanted as I find full power 40 snappy, but then I'm an old fart and don't enjoy recoil as I did 30 years ago. For jacketed bullets I'd go up a few tenths.
The WW 14th Edition reloading manual list the following data for 170 gr. JHP and W-231:
4.5 gr. W-231 = 860 fps = 24000 psi
5.3 gr. W-231 = 1000 fps = 33200 psi
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