Lee flow through expander die correct size for .359" wadcutter

[40-82 hiker]

I am new to the world of a Lee CTP, and I am using my RCBS dies now now to load .359" wad cutters with soft alloy. I want to put a Lee flow through sizer die on it so I can drop powder, but is there anyway to change the flow through expander to the correct size so it does not size down the wad cutter?

I have read a number of threads, but just come away confused. Using soft wad cutter brass would I still want to aim for a .357" expander die, and if so, how and drop powder?

Don't have any Lee dies, and I am not familiar with their line of dies. Sorry if I am asking an oft repeated question, but confusion reigns supreme...

Thanks

[Maven]

40-82 h, The .38Spl. insert for the Lee Powder-Thru-Expander Die, part #2408, will also work with .357Mag. cases. You adjust expander die so that it both flares the case mouth to the desired amount and actuates the Lee powder measure at the same time.