I read an article long ago that had w231 and HS-6 as a low flash powder
for a high vel. 110gr jhp in a 38 special.

As for a 38 snub nose and a +P loading near a factory load,
You will need at least Green Dot or slower powders to get a
consistent load at 950fps or better.
If you have a 3" or longer barrel, most powders will work for
light target loads to full ones with the data out there.

There are also the new "Low flash" powders on the market, that
you can pick up and try out.
I have had good luck in 38 and 9mm with CFE Pistol and BE86.