I have good accuracy out of my snub nose M49 with a HBwc lead bullet from
600 to 800fps, with (12) twelve different powders also (5) five spp's,
over the years of developing loads.

With a 6" barrel, 700 to 800fps works for me, with Red Dot getting my best group,
of all powders tested with my 686 revolver.

If you need a faster load, go to a BBwc , which is almost as accurate,
in my test.
Have fun.