Our gunsmiths will be happy to advise you on how to change the calibre of your rifle (e.g. from 6.5x57 to 6.5x65 or from 7x64 to .30-06).
Please note that the change can usually just be carried out in the same calibre group (Med., Std., Mag.). A new proof in the Vienna or Ferlach proof house is also required.