I've never bothered doing it, but lots of folks report they feel of the press operation getting smoother and easier, so if I had shoulder motion problems operating the press, I might well do it. Also, some complain the super smooth clean surface from stainless steel pin case cleaning increases friction with the carbide. I've only done SS pin cleaning with rifle cases at this point, so I can't say from experience if that's so or not. If it turned out to be true on my press, I would lube the cases then.