I use 30-40 inch*lbs on all my old rifles with wood stocks, with slightly less on the rear screw. I have found that range to be a pretty good rule for wood stocks in general, allowing slight compression of the wood, but not crushing the fibers.
My Winchester 1917, in an original military stock, likes 35 on the front, 30 on the rear. My 1903's seem to like 40 front, 30 rear. My krag gets 30 on both.