found this real good load 158gr speer HP FED #200M primer 15.8grs IMR4227 oal 1.560 crimp on the canalure.
shoots great out of my 4" smith M66 and my 4" colt.
I picked this powder up for $6 bucks at a gunshop in the clerance rack. I wasnt sure what I would use it for but its found a home with the 357

I remember when a pound of powder was about $4, retail.