1biggun, case expansion isn't going to be as much of an issue as case neck thickness, both have easy fixes. The necks just need to be turned or reamed, once they are brought up to size. Just make a set of expanders like I did for the 357AR to bring 223 cases up to 357.
The two case expander stems jus fit inside of a lee powder through expander die and force the case open in two steps from .224" to .357". If you're going below the shoulder it should be muchc easier and you shold have fewer lost cases.