sure if they were created today they would all be based on the 300wby case...
weatherby did release the 6.5-300wby
plus now there are other big options, so I don't see the advantage of wby releasing similar magnums.
a 340wby with light bullets can smoke many of these smaller cals shooting bigger/same size bullets, and do it with less barrel length. of course the BC's will be lower with the 340, but are you really planning to shoot past 600yards? most of us I doubt are.
the 7mm-300wby makes sense, but there are so many 7mm mags out there, 7mm.rem, 28 Nosler, 7mm stw, 7mm RUM,