I was trying to duplicate the British .38 load with that bullet.
In a .357 case and a 2" barrel, 3.2 grains of Unique chronoed at 561 fps, and 3.6 grains at 635fps. Unfortunately, that was in my early casting days, so I couldn't accurately tell you what they were for hardness (probably about 12BHN), but fortunately I was able to shoot a calibrated FBI-spec Jell-O block with both - the 18" of gelatin wasn't an obstacle; the hard rubber backer was what stopped them.