They are scarce for sure.
I'd say, if the brass fits as is, neck size, load them up, fire form and neck size only from there on. That is, as long as both chambers are the same which they should be so you wouldn't need to separate right from left loads.
Or, if you need to FLS, maybe a 400-360 die without the expander would size the body and then neck size for the .358" bullet.
Those aren't exactly common but a bit more available than the 350s.