Starman,

If I remember right, Theo Jung uses Hartmann & Weiss actions. They are phenomenally expensive in the US but also considered the best post war Mauser actions of all. Theo Jung was the first fine gunmaker in Europe to start making rifles for the WSM and WSSM calibers though others may have started doing the same now. Why don;t you send him an e-mail and check with him?

Best wishes and do post pictures of your rifle when it is ready.