Try "The Legacy of Lever Guns" "2000" from rifle magazine.

http://www.riflemagazine.com/catalog/detail.cfm?ProductID=55

I count 27 loads in that special issue on page 57, all loaded to be safe in the Winchester 95, of course.

They include the following for the 250 Hornady:

IMR-4320 48gr, 2,213
RL15 49 gr, 2,247
Varget 47 gr, 2,170

They also include older data (ca. 1955) that looks hotter.