So, I did some calculating with the numbers from Oregon Shepard. According to wiki, fill power is measured in units of in3/oz. If my numbers are right, then I am getting around 117 to 120 in3/oz for the wool.
Keep in mind, this is the insulation that Oregon Shepard is using for housing insulation. The insulation in the garment article says it uses a binding agent. This probably increases the fill power.