I recently bought a Nomad Mk1 with DHX4 coil, it has a 550 spring and I think I probably needs a 500 but have set the sag up etc.
I'm not sure if the 'bump stop rubber' (BSR) is designed to get all the way to the end where the spring holder is or the 'bottom out' adjustment prevents this.

It rides very smooth and feels good but I'm not sure if I'm actually internally bottoming it out as the BSR has about a 1/2" before it gets to the spring retention ring after most rides but as of yet I haven't ridden anything big to cause to blow through the travel.