So, this is not exactly what you asked for but I can add a bit more data just in case you decide to use LSWC.

Today I tested some above-modern-max .32 S&W Long loads based on older reloading data. I had 100gr coated LSWC, and loaded 2.7, 3.0, and 3.3 gr of both Universal and Herco. Those are pretty far above modern max, but older manuals were up to a full grain more powder, so I figured I'd be ok.

Sure enough, even the 3.3gr loads showed no high pressure signs at all. The primers looked perfect and the shells fell out of the cylinder. Recoil for the 3.3gr was very mild even though I was shooting a tiny transitional M30.

My point is that many folks say modern .32 long loads are very anemic to protect older I frames and break apart guns, and my tests to day supported that notion. So in that K frame I wouldn't be afraid to ramp it up a bit if you think it might improve accuracy.