I remember the piggybacks from the early 80s. I tried one and came to the same conclusion you did. They were slow. I also seem to remember larger magnum cases required a tremendous amount of force with sizing. The piggyback idea never caught on.
BTW: Be glad you did not end up with a "Green Machine" Those were real duds.
I ended up buying a Dillon 550 the first year they were introduced and have not looked back since.
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