Country, you might want to do a bit more reading.
Sleipner comes out ahead of Sverker 21 in all but two areas. Abrasive & Adhesive wear.
Those two wear areas are of little importance when making tooling to work copper or lead.
Gross cracking & plastic deformation are very important for this kind of work, and Sleipner comes out ahead in both. It is more machinable, which can mean a better finish before lapping.
I have cut up literally tons of tool steels in my career. I really like Sverker 21, it is great steel for many parts. But the Sleipner material is superior for forming & coining tools. I saw a 20% life increase in a tool that always cracks eventually.
It works very well at 60Rc, and has a nice fine grain structure. This is not conjecture form reading a spec sheet, but practical experience. I make tools for a living.
If you want to read the actual spec sheet:
http://www.uddeholm.com/files/PB_sleipner_english.pdf
About 10 pages in there is a comparison chart if you need a graphic representation.
B.