Have you tried the powder companies websites?
www.hodgdon.com
www.accuratearms
www.lapua.com/vihtavouri/
www.winchester.com then click reloading pages
www.imrpowder.com
These are the ones I can think of offhand. Go to Shooters and you should be able to find more.
If I recall correctly, all 1901s were built with steel barrels for smokeless powder, unlike most of the 1887s.
Gunslinger, if you're reading this could you confirm this or correct me?