Going out on a bit of a limb here, I suspect you don't consume the .500's in enormous quantity like some of us go through 38's .45's and 9mm's.
That said, you might want to explore some of the more basic Lee equipment. Not refering to a "Lee Loader", but some of their starter kits with a single stage press. If you load only a few hundred rounds a year, that's all you need. A case cleaner would be a nice addition, but not really necessary. I loaded for years without one. If my assumption regarding quantity is off base, then proceed to the Dillon website.