The lightest that I've actually ever gone before was 10gr of 2400. Can't recall offhand if it was with a 180 WC or the 245g Keith...In the Redhawk or 29 they didn't even have any muzzle rise. I kept checking the barrel they was so light. None ever squibbed on me though. the RH is a little on the large side for a youngster so in the dimunitive Bulldog they still might be a little flashy is why I'm considering even lighter.
Hup, back to work. Off all morning and now I get busy at quitting time.