Of course I had to pull one down to satisfy my curiosity.  Winchester claims 2460fps for the 180gr bullet.  I was surprised to find 39.4gr of a stick powder, certainly not 4064 as I had some of that to compare.  I was expecting a ball powder.  .033 thick grains, about .085 in length.  Looking on the Hodgdon site, IMR4166 appears to be a likely candidate, producing 42,300CUP.