I personally use Win 231 (Same thing as HP38) for light loads in the 45 acp, but I use 200 - 215 grain cast semi-waddcutters, usually. Generally cast are a better choice for light loads as they are less expensive then jacketed, and less likely to "stick" in the barrel at minimum speeds.
I would look at a good manual, like Speer or Lyman, that shows starting loads with jacketed bullets for reliable info. I seem to have better luck using Unique with loads closer to full power in the 45 acp as far as accuracy and clean burning go. If you are a shotshell reloader as well, you might have some Red Dot on hand. It also works well for reduced loads, at least with cast slugs.
Larry