Rimrod is Correct--Lee .357 Mag dies will not work with .38 Special
.38 Special Lee Dies will handle .357 Mag too.
.357 Mag Lee Dies will NOT do .38 Special.
In the .357s the problem is both the expander die and the bullet seating die. Neither can be turned in far enough to reach the shorter .38 Special case. The resizer die would work but that's all.
As suggested, buy the DeLuxe 4-die .38 Special set and you have both capabilities. In fact, last night I loaded up some test rounds for .357 Mag with my Lee .38 Spec. dies.