Lee

Just re-checked my references source, the bolt on the commercial Mauser Magnum was 6.770" long cf 6.370" on the DWM 09 Argentine and Standard M98 Oberndorf actions.

The distance betwen the magazine screws was however the same for both magnum and standard length actions at 7.835", sorry for suggesting otherwise

As Marakai says the book "The Mauser Bolt Actions ~ A Shop Manual by Jerry Kuhnhausen is possibly the best book on the subject.