I prefer 124’s, don’t mess with 115’s for minor power factor loads as that gets into trans-sonic range (115gr @ 1087 fps = 125 Power Factor). It seems contradictory, but you use slightly LESS powder as you increase bullet weight to maintain a consistent power factor.
No opinion on Win231 other that my one load workup posted top Doodie - I haven’t touched it since.
Be aware that you will get different loads using jacketed vs. lead/polymer coated/plated. I haven’t messed with jacketed pistol bullets in forever, strictly polymer coated these days.