The Dillon swager does quite well... but you learn to loathe it after the 15,000th round or so.
Swapping calibers on a Dillon progressive can be done on the cheap (reusing the tool head and powder funnel/primer tube assembly) or on the spendy side (seperate setups per caliber).
It looks like it will cost me about $300 to swap to a .308 setup on my XL650.
That includes the following:
Case feeder plate (large rifle)
Dies
Tool heads (x2)
Caliber conversion kit
Powder funnel
If you go this way, you can build the toolhead up with the dies and powder funnel and not have to swap dies out back and forth on one tool head to change calibers. If you don't mind doing the work to reset your dies everytime you change calibers you only need the following:
Dies
Caliber conversion kit
case feeder plate
(possibly a magnum powder bar)
So, it can be done for a bit less this way.
I also have a copy of the Dillon XL650 owners/operation video on DVD if anyone would like to have it.