Made up and unsupported claims are not facts.
You may want to consider an enema. It will help clear up your thinking process.
Rounds designed around the 338wm, 30-06, 308win and 284win cases have all had long range records. Built on custom rifles.
As it is now. The wsm case is without question. The leader in long range performance.
Of the list of cases used to produce long range performance. There is only one belted. The rest are all non belted and in the design of the belted case, the belt was not utilized. They were design to head space at the shoulder. They were simply chosen for capacity.
Of the variety of the cases used. The majority of them have been of the short case design. The design of the 6.5/284 was so successful that the idea of increasing capacity with a fatter case of relative length was successful. Without doubt.
The inherent accuracy of the short case with a larger capacity. What a concept. And a successful one at that.
Not only is the wsm an accurate round. It will produce equal or greater energy with 10% less powder than a comparable belted rounds.
This doesn't make the belted rounds any lesser. It simply shows that the times they are a changin. For the better.
In the hunting arena. Most any round from 270 up can be considered for all around. It just so happens that the wsm does it with greater efficiency and inherent accuracy.