I'm looking for new or once fired 358 Win brass. Anyone have any they can get rid of? Thanks!

You could always get a bunch of 308 brass and resize it to 358.

This is exactly what I would do. 308 brass is easy to find and usually not too expensive. Makes sense to run it through a full length sizing die and fireform it to your chamber. Problem solved.

Not exactly. I'm not reloading 358 Winchester. I'm using the cases for a 358 Wildcat, and it works much better to start with the 358 case. If you start with 308, neck thickness can be an issue. It can be done, and some guys do go that way. Just a much simpler operation all the way around to start with 358. Just trim the neck and full-length resize.