I use Hornady .314" HBWCs (not the SWC) in .32 S&W Long, .32 H&R, and .327 Federal.
If you keep them under about 850 fps, you shouldn't have leading problems.
I've had good luck with Unique (ignoring the filth) and HP-38/W231. I've experimented with Titegroup, but it doesn't seem to keep the bore sealed as well as the other powders. Right now, I'm on vacation, and can't tell you what other powders I've used.
Generally, I just go for Unique. It's predictable, and the soot is easy to clean up. (bore fouling is not a problem)
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