It was labelled ''medium load'' and if I recall correctly,it pushed a lead SWC at around a claimed 1000Fps.It was offered in the late '70s -early '80s.
To my knowledge,nobody is offering such a load nowadays.Guess you'll have to either load your own or go with .44Spl.
Qc
I bought some to use in my Ruger single actions. Full power were no problem in the Smiths but the Rugers rolled up in my hand so hard it was a knuckle buster. When I started reloading I still had 4 boxes left. Put them into storage just because I had the brass and it was easier to roll my own.