"Back in the days of the Dinosaurs both Elmer Keith and Jeff Cooper advocated loading 158 gr LSWC bullets with enough Red Dot and or Green Dot powder to achieve 1000 fps. in 2 inch J frames. This in the 1950' and 60's."

Those two did advocate heavy handloads but I'll suggest that they didn't achieve those velocities with Red Dot and Green Dot. More like Unique and 2400.