I just scored 4 5/8" Ruger Single Six in 32 H&R magnum off Gun Broker. Waiting for it to be shipped to my FFL and then the Maryland 7 day hostage crisis before I get it. I have a NOE mold that casts a 102 grain swc and it shoots very nicely out of my 3" SP101. NOE makes some nice stuff!
Years ago, I had a Ruger Single-Six chambered in 32 H&R Mag and I wish I still had it.
I currently load the 32 S&W Long and would not mind adding 32 H&R magnum back into the rotation if the right opportunity comes along.
I use a 4 cavity Accurate 31-100R that drops a bullet nearly identical to your NOE 102gr SWC, right down to the same weight and form. As you know from your SP101, that bullet shoots very well. You are well equipped with that mold.
Back when I was loading the 32 H&R Mag, I wasn't casting my own bullets. But with commercial bullets that consisted of both wadcutters and semi-wadcutters in the 95-100 grain range, I was using mostly WW-231. Occasionally when I wanted to abuse my hearing and all those around me, I would use a stout charge of H-110 [WW-296]. You could easily get the 32 H&R Mag supersonic with H110, but it was obnoxious and totally unnecessary.
If you keep a solid wadcutter or a SWC between 900-1000 fps in the 32 H&R Magnum, you get the best of all worlds. It’s accurate, not obnoxious, easy on lead & powder and corrects the shortcomings of the 32 S&W Long in terms of power. WW231(HP-38) works nicely for that task but you mentioned you don’t have that powder. There are plenty of alternatives.
The 32 S&W Long is a great cartridge, but it is occasionally seen as slightly underpowered (I think it’s fine within its limitations). The 32 H&R Magnum corrects that one complaint about the 32 S&W Long while maintaining economical use of lead and powder.
For small game handgun cartridge, a solid wadcutter of about 100 grains in a 32 H&R Mag, really shines! You get a full diameter flat bullet nose for the caliber, and fine accuracy at handgun ranges. That deep seated wadcutter also allows for slightly better efficiency of powder in that magnum length casing. You don’t need a lot of speed, a little over 900 fps and load for the best accuracy.
Enjoy your new to you revolver!