I have a Douglas XX SS .308 Barrel 22" long 1-10 twist. I would like to rechamber it to 30BR Have it cut down to 17" and to fit my 12 Target action Large Shank that has been made into a pistol. What bolt face caliber would I need to do this? I would like to get a bolt face I already have to save a buck or two. I assume It will do better in a short action whether Rem or Savage? Can a bolt face be changed on a savage to work? Thanks lou