Kieth
I purchased an Armour Alloy Contender some years ago, at a very good price, that came with both a 357 Max and 357 Mag barrel. I figured I didn't need the 357 Mag barrel so sold it off.
Then I contacted TC and found out they don't recommend shooting 357 Mag or 38 Specials out of a Max barrel, they said it may cause barrel ringing, and then when firing 357 Max cases they may fail. I'm not quite sure why this would be any different from shooting 38 specials out of a 357 Mag, but that's what they said.
So anyway, I wish I'd kept the 357 Mag barrel for practice loads. For deer hunting, my 357 Max is my top pick.