Nope. That's the practice I adopt and encourage myself. Also if you are in a jurisdiction where you need to qualify with specific firearms you could qualify with a .357 magnum loaded with .38 special. The firearm is easier to handle plus the ammunition is less expensive than .357 magnum. That's what I did before we had the "any" revolver qualification in Nevada. I do put .357 magnum through them once in awhile.
The only caveat with using .38 special in a .357 magnum is the crud build up in the chambers because of the shorter round. If you reload, you can get around this by using .357 magnum brass with .38 special (+P) charges for your range ammo. It just makes cleaning more of a chore. It would not surprise me if most current current production revolvers use the exact same parts for .38 special and .357 magnum except for the cylinder to keep production costs down.
.38 special standard pressure is about half of what it is for .357 magnum. +P is about 9.5% more pressure over standard pressure. 38 special.
I don't see any reason to purchase a .38 special only revolver when a .357 magnum does the same thing with only a minimal change in the size and weight of the firearm. If you presently have a .38 special revolver make sure it is +P rated. Quite a few of them are not. I have a friend that carries an old Charter Arms .38 special that is not +P rated. If your .38 special isn't +P rated, you're better off using .38 special standard pressure personal protection ammunition available from Federal, Fiocchi, Hornady or Winchester.
Fortunately we have enough ammo makers out there that still acknowledge the need for standard pressure personal protection ammunition so it's not difficult to obtain.
Know the law; don't ask, don't tell.
NRA & UT Certified Instructor; CT, FL, NH, NV, OR, PA & UT CCW Holder
Happy new 1984; 25 years behind schedule. Send lawyers, guns and money...the SHTF...