I didn’t have .32S&W-L dies when I was loading some .32short.
I used the Lee #4 shell holder (same as one that works for .223Rem, ect) and a set of Lee .32acp dies.
Furthermore, I was using the Lyman #311252 78gr RN mold to cast the bullets. Sized them to .311”.
The Lee .30 dipper that comes with the .32long dies is too big for the .32short. I used the Lee powder thru expander die and Lee powder measure with the Micro discs. I used #231 powder and Federal #100 primers. Cavity .21 IIRC.
BTW, Lee no longer makes the microdiscs measures.
I don’t know if the seater/crimper die of the .32 SW-L dies is short enough to work with the .32s.
In a friends S&W .32-L Hand Ejector, they were astonishing accurate. At 7yds I was seeing 1.5” 6-Shot groups. They chronographed at ~650fps. (Lyman Cast bullet manual #3 data).
If loading black powder (BP), you’ll need to make a powder measure from a .22lr case and copper wire as BP is very sensitive to possible static ignition. Do not use ANY plastic measures or containers. Only non-sparking metals (Aluminum and brass/copper)
Powder charge is easy, just enough room to allow seating of bullet over a compressed powder charge and crimp bullet. An over powder fiber wad is optional.
Use SPG bullet lube!!!
If you don’t cast, Others can recommend a source for bullets with suitable lube. Lube is critical as most commercial bullet lubes are incompatible with BP.
There is, IIRC, a thread on loading the .32SW-short over at castbollits.com.
Also, be sure to clean the gun properly. BP is hydroscopic, (draws moisture! And forms acids that cause aggressive corrosion.