Re: SW 32 long
It belongs to the family of cartridges 32 S&W -> 32 S&W Long -> 32 H&R Mag -> 327 Federal Magnum.
The shorter ones will always work in the longer chambers.
I have bought a number of 100 year old Colt double action revolvers in 32 S&W Long. I make scope mounts for them, and unscrew the barrels, and re time the cylinders.
In all of them I have soon blown the forcing cone with experimental loads. I weld up the forcing cone and re cut it. Then the forcing cone seems to be able to take anything.
The most power for the least pressure I have found experimentally is with LIL'GUN and with 800X.
I want the bullets to seat at 1.29" or 1.3". There are no bullets with a cannelure that supports that. I have been crimping them upside down in a 308 Lee factory crimp die. I made a bushing so they drop down in the right amount.
I can get 1413 fps with 85 gr and reasonably low pressure.
Not much pressure, but a lot of recoil, so I need the crimp, or the bullet yank out and jam.
If you want the smallest groups possible, you are going to want to use hollow base wad cutter cast or swaged bullets seated down into the case until flush. With a tiny amount of Bullseye or Unique powder. This would imitate the old 38 special target loads that got such tiny groups.