I just purchased the second edition of Modern Reloading by Richard Lee (revised in 2021)
I don\’t think Lee does their own testing, but rather compiles load data from several different sources.
This manual includes many loads for a 146 Grain Jacketed Bullet in .38 spl, .38spl+p and .357 magnum.
It does not specify the brand or length of the bullet, it just says \”146 grain Jacketed Bullet\”.
It has loads for:
.357 magnum using 15 different powders
.38 spl using 13 different powders
.38 spl +p using 15 different powders.