GrafsI'd stick with lead.
The gun was designed for it, light loads are going to work best with them.
I cant think of a single jacketed bullet available with the 32 Long in mind.
Ive used 115 home cast, the above Lapua wadcutter bullet and the defunct 95 grain swaged Hornady.
Hodgdon doesnt list CFE in the 32 Long, but I would be apt to use Universal data, which starts at 2.7 grains and is max at 3 with a 85 gr. jacketed bullet.
Its a tick slower than Universal.
For a lead round nose or swc 2.5 to start.