I am not familiar with modifying mauser actions but I can tell you that both the wsm case and any of the 300mag cases that I know of have larger rim diameters than the 30-06.As such some bolt face work would have to be done.As well the .325 is a larger bore diameter so you would either need to rebarrel or rebore the existing barrel.Lastly the larger case diameterscouldcause feeding problems.