Crucible rates it for 63-65 Rc.
The furnace a Bos HT (according to Paul) max temp will come a few degrees short of able to hit more than 63.5 (possibly 64).
I shaped and ground two blade blanks that were 63.5 when I rockwelled them and that seemed just fine. They ,led me to this project.
If I end up feeling that I need another 1 to 1.5 points when these are done, I will look to go higher but doubt I will need it.
We will see.
Tim