Maybe consider the class 300 H&H? Can be loaded to match the 300 Win, smoothest loading / cycling 300 in existence, can be reamed to a 300 weatherby if you get bored with it someday. That’s what I’m having built currently.
The 300H&H is one of my favourites in my safe, but finding brass is trickier and it tends to stretch a bit more.
If it can be loaded to the 300WM, why not just build a 300WM ..... or as dumb dumb suggested, build a 7mag to custom specs.
