What do you mean by convert? for example I have a '09 Argentine that was action grade only and I bought a new barrel, for it to make it into a 7x57 my favorite cal. added a Timmy trigger, and scope she will blow the x out of the target at 100 yards, but I hand load, Speer 145gr or Hornady 154 gr over IMR 48 to 49 gr. Is that what you were asking? You can get barrels depending on your budget, ask a competent gunsmith where he gets his barrels from.