Hello aguncrank, My Sierra 3rd edition Handgun Reloading Manual lists 9.2 (nine point two) grains of H-110 as the starting load for the 90 grain HP and 11.0 (eleven) grains as the Max load.
The data used a Win. case, Federal 205M primer and was tested in a 10" Contender.
The starting load produced 1400 fps and the max load gave 1700 fps.
Hope this helps!
GOOD SHOOTING!
Slufoot