I've got a Rock Chucker Supreme.
Then you only want a 3-die set. You'll be doing Seating and Crimping in the same die.
The reason is that in a single-stage press, like the
Rock Chucker, if you crimp in a separate die you will soon tire of having to place
every round back in the press for one simple additional operation.
I like single-stage presses, but you cannot imagine how
LONG it takes or how utterly
BORING it gets to load 200 pistol rounds. Your time is
not taken up with reloading.
All your time is spent in "material handling"; that is... moving cartridge cases,
1 at a time, from one stack to another.
With 3 dies you have to handle each and every cartridge 3 times. That's a total of 600 "touches". If you do crimping in a 4th die, then your "material handling" zooms out to 800 touch times. You've just increased your boredom by 25% !! No one does that... not even stupid people.
Just saying.