I dug through my old stuff, and found a handful of ancient U.M.C. 32 S&W rounds. They had all had their primers struck (misfires) and were just old, tarnished junk. I pulled them apart and found .310" 88gr round nose bullets, and about 7gr of black powder in balloon head cases. I had to chisel the powder out. A lot of the granules have been ground into actual powder by the time I got it out. Maybe when I get time I'll re-lube the bullets and load the cases back up with new black powder.
Also, I found the reference to a .32 H&R Long: https://www.thefirearmsforum.com/thr...evolver.77627/
There are photos a revolver almost identical to mine. Mine is an H&R Automatic Ejector Second Model 1st Variation, made around 1890. He says: "as stated below the caliber is 32 S&W. this revolver was made before the 32 S&W Long was introduced. it could chamber and handled what was called the 32 H&R Long cartridge (an obselete cartridge that was longer and more powerful than the 32 S&W)"
That's a little confusing to me; which is it, short or long? Made for one but will "handle" the other? Oh, well, doesn't really matter. I'm over it now. I'll consider it a .32 S&W, load a few short cases with black powder, just like dtknowles suggested in post #2, and call it good.