Have been doing them at 90 degrees. (actually put them flat on the milling machine in the inverted position w/ an aluminum plate underneath to protect the machine table) It seems that would duplicate the original stock geometry, but I don't get the 4-7 lbs up pressure that the rifles seem to like. 2 degrees seems like a ton of bevel. I've a largish angle plate that is easily adjusted for tapers measuring in thousandths of an inch per foot, so fine tuning would be relatively easy. I just don't have a pile of stocks with which to experiment, and once assembled and cured pulling apart the "repaired" fore end isn't really an option. Just been hoping someone has already invented this wheel.
If it weren't for the problem of obtaining another 1913 dated Rock Island single crossbolt m1903 stock in good condition, I wouldn't even consider fooling around with this repair.
Edited to add: 1 1/2 degrees over 10" is about 0.262" whilst 2 degrees is about 0.349". Too much, me thinks.