Scott, welcome to NitroExpress!
You are in the right place to learn about your new rifle.
I recently had a 350 Rigby Magnum, which sounds to be the chambering yours will be in also. I have brass and dies for it but had started talking to another member here about a sale. That was months ago and I am not sure he still needs them. Will try to figure that out and get back to you on it.
Otherwise, please get pictures up when you receive it and the knowledgable gents here will tell you all you need to know.