If I had a 357 Max case I could measure it and compare it to a 357 Mag case and tell you, but I don't. sorry.
If you do, here's a way to do it.
Measure a Mag case and get the OAL.
Measure the depth of the inside of the case. Subtract that from the OAL and that is the thickness of the web.
Do the same for a Max case and compare.
You may have to subract the depth of the primer pocket to get the true web thickness.
Hope this helpsl