I have a dillion 550B and i use it as both, sorta.
When I'm working up test loads or hunting loads I measure each case separately for the powder (the larger extruded powders vary greatly in the dillion powder measure +/- at least a grain), and then continue with the progressive bit, the nice thing with the tool head there is little readjustment and normally only on the seating depth. With pistol loads or loads that utilize finer powders I just go the normal progressive routine.
I still have my old Herters single stage press, but the poor old fellow is just gathering dust these days
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