I am not exactly sure when this bullet was designed, it dates back to the early days of the .357 Magnum. A very useful bullet, with two crimp grooves so you can use the bullet seated to the top groove in .357 Magnum brass or use the same loads in .38 spl brass and crimp at the bottom groove.
I have shot a lot of these over the last 50 years and without gas checks in standard .38 loads and with gas checks for high speed ,357 loads. This bullet works well with Hodgdons Lil' Gun powder, Hodgdon load data indicates 1577 fps with 18 gr, (158 gr, bullet) with only 25,800 cup. Their load data is referenced with a 10" pressure test barrel. In my 4" GP 100 I am getting an average of 1450 fps, using the Thompson GC bullet, which in my alloy weighs 155 gr., with the copper gas check.
Good performance with a cast bullet in a 4" barrel.