6Gunslinger,
The same is true concerning my 642-2 and my Model 36 Chiefs Special. My Model 36 has a shorter cylinder and the flash gap is a little wider. Now comparing my 642-2 with another gun, my S&W 640-1, the cylinder lengths are the same. And while the 642-2 will only chamber .38 Specials, my 640-1 was built for .357 Magnums with the option of using .38 Specials. I guess S&W decided to economize by using .357 cylinders on their 642-2 but for safety reasons designed them to chamber only .38 Specials.
The same is true concerning my 642-2 and my Model 36 Chiefs Special. My Model 36 has a shorter cylinder and the flash gap is a little wider. Now comparing my 642-2 with another gun, my S&W 640-1, the cylinder lengths are the same. And while the 642-2 will only chamber .38 Specials, my 640-1 was built for .357 Magnums with the option of using .38 Specials. I guess S&W decided to economize by using .357 cylinders on their 642-2 but for safety reasons designed them to chamber only .38 Specials.