If it's clean and doesn't bind when it's out of the press, then something must be binding it when it's in the press. It's probably not worn. I've made over 4000 rounds with my press and it's still smooth.
I did see a video on youtube for disassembling the primer chute for removing burs and cleaning. See if you can find that and maybe take it completely apart for cleaning.
Or try loadmaster.com Lots of Loadmaster users there that can help.