There is no shortage of reloading data for .38 S&W. And in most cases, .357-.358 bullets (.38 Special) will perform completely satisfactorily. .360-.361 bullets are recommended, but by no means are they essential. I have used .38 Super dies for many years for loading .38 S&W with no problems. My standard .38 S&W load is 124-125 grain cast bullets with 3.5 grains of Unique. I have used 4.0 grains of Unique with no problems in old top break revolvers, but I feel more comfortable with 3.5 grains.