I have several .32 H&R Magnum revolvers (and a TC Contender custom barrel).
My Ruger SP 101 is an excellent platform for this cartridge.
Ed Harris has an excellent, pressure tested, article on loading the .32 H&R magnum with some excellent tips.
Send me your Email address in a Private Message, and I'll forward you a copy.
Use for the .32 S&W Long and .32 H&R Magnum?
They are excellent small game cartridges when hand loaded with good bullets. I shoot only my own cast bullets and find a Group Buy 100 gr Keith or the RCBS 98 Gr Keith to give excellent results. Frankly, I shoot many more .32 S&W Longs in my .32 Mag revolvers as I find they shoot very well, perform better than ANY .22 caliber from a revolver on small game and cost little to reload. I will often run a 1000 rounds through my Dillon 550B and find they don't really last all that long.
The cast bullets use considerably less lead than the larger calibers, if you need justification, and the smaller powder charge required is also economically advantageous. I just find the power level is very useful for general target and small game shooting. All in all, a very practical cartridge whether using the .32 S&W Long or the .32 H&R.
They make an excellent training round for new shooters who are interested in becoming a "complete shooter". That is to say, those who want to learn how to cast bullets, reload, shoot and hunt.
I would like to caution those who are interested in finding a used Ruger SP 101. Mine does NOT shoot to the sights (the rear sight is "windage adjustable only") with any load tried. I have vision problems, so I had my pistolsmith install a Weaver base on mine and installed a Red Dot sight on it. My pistolsmith thought I had lost my mind, but it is a VERY nice combination:
Dale53