It is usually not possible to chamber .38 Super in a .38 Special or .357 Magnum revolver, since the cases will be too large in diameter.
I tried a one of my .38 Supers in the chambers of both my Model 66 and Model 686. Neither would chamber far enough to allow closing of the cylinder.
I do not know why we keep seeing posts about shooting some cartridge in a gun for which it is not chambered. With very few exceptions (.38-.357, .44 Special-.44 Mag., etc.), and there is almost always no good reason
to do it.