To elaborate, the 550 only has 4 stations, so #1 resize/deprime and prime on the downstroke, #2 expand/powder, #3 seat, #4 crimp. Like you, I prefer to size and crimp in two steps instead of one and, on those taller cartridges, it is hard to see the powder.
Thanks for the explanation. Looks like it will have to be a 750 for me.