Thanks for the url of the printer test images. I downloaded them and when I leave the AdobeRGB profile assigned to it and add a soft proof layer to it with my printer profile I get indeed about 40% OOG. But when I assign the profile created by the X-Rite colorchecker camera calibration software all of a sudden the soft proof layer seems to be inactive (or all colors are in gamut, which a doubt).
When I do the same in The Gimp I see much colors are still OOG, in Affinity I see none. So, the problem seems only there when assigning color profiles from the X-Rite colorchecker camera calibration software to a document in Afiinity. Then the soft proof layer seems inactive and I can not soft proof for prints at all.
Emile Spaanbroek got a reaction from kirkt in Soft Proofing not working with custom ICC profile