Yes,....there are no SECRET powders out there,....AA#9 is one powder 1100FPS with a 200gr JHP and 950fps with a 250gr JHP....Lead won't be much different as long as it's gas checked.
They also said POST-War Guns.....Newer than 1945, everything with pre-war guns(Colts) changes as they usually have .454" bores....and BB lists no pressure to their loads.
BB only says STANDARD PRESSURE,......This is what I would be loading from ....and it's listed as safe for SAAs by Hornady.