I have the rcbs bullet feeder on my 650 (9, 40 and 45). It works well with plated and jacketed bullets (most of the time after a learning curve). lead and molly coated bullets it does not work well with ( it will just drop a lot of bullets al at once).
The week part of the system is the die that drops the bullet, it has a plastic cylinder with some fingers with rubber band that the bellowed case make bullet release. These rubber bands are like orthodontics type rubber bands (real little). If you double the rubber band and do not leave bullets in this die over night, it seems to work well. When you leave bullets in it for a period of time it will just drop every bullet in the tube all at once.
I have bought one of the horandy dies to try incorporate into the system to make work better with moly coated bullets, but have not ever tried at this point ( my interest right now is rifle, which I do not use the 650 for except for when loading for ar type)
Hope this helps.
Allen