Ireland Rear coilover spring rate

[70roundtail02]

Anyone running these? What spring rate are people running for the rears?

I’ve searched and seen everything from #440 to #600.

Car will be used mostly fast road / touring.

 

[rsporsche]

600s are pretty stiff. are the springs progressive or standard wound?

 

[bavbob]

For some reference, these are for e24/e28 which I think is a heavier car: