That is a very fine rifle, I have one similar except in 8x57, action is a 1912 Oberndorff just like yours. You can see it here. > Nitroexpress site > Mauser Forum & Archive > bottom of the first page, I'm sure you'll pick it out.
Just out of curiosity - what is the "proper" torque for the action bolts on these / any other Mauser actioned rifles??
All take care. --- John