All I know is that in my J frame snub nose with a 158 gr lead bullet..............
5.0 grs of Unique with a cci std primer and heavy crimp,is all the +P that the ladys of the house, want to shoot.

5.4grs is ok in a K frame,due to the heavy recoil.....It will
get your attentin in a light J frame.

4.5-4.7grs makes for a nice medium load in most revolvers.