No, the Hornady expander die (I'm assuming this is for pistol cartridge) is not hollow, and does not take a PM installed on top of it.
If you are using this for rifle cartridges, you will need (if you don't already have one) a Lee rifle charging die to work with your PM.
Hornady does sell, at considerable expense, a case activated linkage, with optional powder through expander dies, but it works with their PM (or RCBS). Total cost for linkage, expander, and PM would be probably more than you spent on your whole press, but it does work very well (it is the same setup they have in their progressive press).
Andy