Starmen
the large ring intermediate action you see on the Theo Jung webpage as .300 WSM started live as an original intermediate Mauser 7x57 action. A friend of mine sold his original 7x57 rifle to him, which was used for this project ( what a shame ).

To this moment of time, I know nobody who manufactures a new intermediate one. Even Hartmann & Weiss uses Mauser Modello 1909 Peru action for this job. For small cartridges the can ground the large ring to a small ring configuration. The magazine lenght is 79 mm or the requested 3.1 inch this action is perfect for a 7x57 Mauser.

Mehul Kamdar
someone must have misguided you on the assumtion that Theo Jung is using Hartmann & Weiss actions.
He has introduced, together with the German distribitor "Alberts" a magnum action which is a direct copy of the Hartmann & Weiss action in terms of look and design a couple of years ago. The two major differences what H&W invented against the original Mauser magnum ( longer thread 21 mm against 16 mm , and thicker left lug ) are also find on the Jung / Alberts action.
There is mayby a possibil difference in the manufacturing methode casting against milling but othervice they are very close looking.
Robert