I doubt that it will ever happen, and here is my theory why. Around the turn of the last century there were many mild medium bores. Blackpowder had only recently been de-throned and there was a portion of the hunting population that wasn't ready to accept that the tiny little 6.5 mm through .30 caliber military cartridges were in fact big game cartridges. For those that wanted or just plain needed more, there were the mediums. The British had raft of .350s and such, the German made god knows how many 9.3s for the colonial market. One of the major design criteria for the 9.3 is that it fit in the standard mausers of the day and could and was produced cheaply. So many were produced that it isn't going anywhere in Africa. That it works doesn't hurt either. The Americans had their .35s and such, and nobody argued that bigger wasn't bigger. There was another huge factor that was in play at the same time; practically everyone shot iron sights and effective ranges were more limited by the sighting equipment than the cartridge.
Things started changing when one generation started dieing off, and another was discovering that faster was another kind of bigger. Winchester put magnum length bolt actions in the hands of everyone that wanted one, and Weaver changed the shooting world overnight by offering affordable scopes. Scopes were for the first time something that wasn't a plaything of the rich, the serious enthusiast and those with failing eyes. The mild mediums were getting their grass mowed by flatter small bores that killed just fine on the one side and the magnum mediums from the other. They aren't best for anything. Even hunters in wooded areas that they didn't offer much that was special.
Mild mediums are as good as dead. Scopes killed them.
Things started changing when one generation started dieing off, and another was discovering that faster was another kind of bigger. Winchester put magnum length bolt actions in the hands of everyone that wanted one, and Weaver changed the shooting world overnight by offering affordable scopes. Scopes were for the first time something that wasn't a plaything of the rich, the serious enthusiast and those with failing eyes. The mild mediums were getting their grass mowed by flatter small bores that killed just fine on the one side and the magnum mediums from the other. They aren't best for anything. Even hunters in wooded areas that they didn't offer much that was special.
Mild mediums are as good as dead. Scopes killed them.
