My "thoughts." Winchester's 14th Edition "catalog" has a lot of data for the various Winchester shotgun powders in the pistol calibers. They don't list WST for any bullet in 9x19, but they do list a WSF load for 147 gr lead. Curiously, they list a WST load for every bullet weight in 10mm - from 150 to 200 grains.

I am not a notably "nervous Nellie" about reloading, but I am not nearly as fond of WST in .45 as I was of 452AA. It seems like every time I get another can of WST, I like it a little less. Have you considered something like AA2? Accurate shows on-line data for AA2 and 147-gr lead in 9x19. If fast powders are what you are looking for, AA2 seems to be a very good one for this type of load.