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It won't do anything that a 338ultramag won't do in North america and it isn't legal for the really big game in most of Africa.

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It's already out there and it's called the 358 STA.

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Nothing stopping you from making one, if that is what you really want.... i reckon the reamer has already been made to do this and a set of dies is only a phone call away from Redding

It's already a named wildcat. Called the .358UMT. I too would like to see it standardized though. I think it would make a heck of a round.

So you want it based on the 404 Jeffery's case instead of the 8mm Rem Mag case.[8D]

I doubt that it will happen. It seems that sells of anything but the 300 ultra have flatlined. The 7mm & 375ultra'sseem dead in the water. The 338 (the best of the bunch imho) has a limited following. So I doubt that Rem will spend any money on the R&D of any new Ultra's.