In the face of everybody’s willingness to experiment, let’s keep one thing clear:
There is no INTENTIONAL compatibility between .38 S&W and .38 Special/.357 Magnum.
The .38 Special was NOT designed as a longer and more powerful .38 S&W. The company abandoned its own .38 and instead made the new Special round compatible with the .38 Colt to tap into the military and civilian market for that round, which was quite popular and the official service caliber in 1899. They even wrote it on the barrel in the early years.
As I indicated above, any .38 S&W that fits a .38 Special is the result of generous tolerances, either in chamber or ammo production. It’s not SUPPOSED to fit