40 grains of IMR4064 shoots to the sights for me with the Hornady 205 grain soft point. It is slow, not even breaking 2000 fps though. Worked fine on a Mule Deer though. Faster goes higher, IIRC factory stuff from the 30's shoots a foot high and clocks at 2340 from the short barrel.
Btw, the data with Lee Dies is actually their already weak 8mm Mauser data.