I load coated and non coated cast bullets on my Dillon 550s and 650s and the Dillon expander works fine. Many thousands of rounds loaded. Just run it as designed for a minimum of fiddle time and I think you will be very happy. A thousand rounds a month could easily be met with a regular 550 and caliber changes are cake. Maybe 2.5 hours loading time but a 650 even faster and extra station for powder check die if you need it. I would not recomend a 550 case feeder as I have not found it to be as reliable as the the 650s. Buy dillons case feeder for a machine that will work great without headaches of something homemade and a no bs lifetime warranty.
Dogdoc