My mother gave me a 4" barrel S&W Combat Magnum (aka M19 later) when I graduated. I carried it daily in Vietnam and later when I went out for a walk in the woods or hunting. It is a .357 but you want to shoot .38s for practice and carry .357 for business. I am very partial to this revolver for the use you mention. I have found it to be accurate, reliable and portable with .38 and .357 loads. I have other revolvers -- but this is the one that usually gets the call.
It is a good night stand revolver as well, but I use a SIG for that now.
Back in the day when I got the Combat Magnum we did not know you were supposed to use .38s for practice. So, I went to the PX and bought a bunch of boxes of .357 and practiced with that for a long time with no problems. I did have some access to military .38s for the old 3 gun (.22, .38 and .45) target shooting as well now that I think of it. I reload the .357 cases for .38 power level target loads. When the .357 cases split at the mouth, I just trim them back to .38 length and reload away again.
The M19 is no longer in the S&W catalog -- that's too bad. But if you see a used one in good condition, I'd snap it up if I were you.