Lee dies for the 7.62X39R DO WORK, I've loaded hundreds of rounds using the Lee dies.
In using 32-20 brass you do have to trim the back of the rim about .10 but they do work. The 32-20 brass is too short to get the gas seal system on the Nagant to work, but the ammo works.
I bought a bunch of ammo that came with boxer primers so I have a good supply of brass. I use the 32-20 in a pinch.
But the Lee dies do make some nice loads.
I shot this target at 15 yards with ammo loaded with the Lee dies.