Since the rifles a 98 mauser which makes bolts fairly easy to find, the most cost effective way to change would be to replace the bolt. The headspace has to be set in the re-barrel anyway. Changing a bolt face to a smaller size is a much more costly process than simply buying a replacement, as long as the action is a standard 98. A good friend brought a commercial mauser to me to be rebarreled. He was looking for a 35 Whelan. I owed him some money and paid it off with a barrel installed by another friend who owned a reamer.. When I went to install the barreled action into a stock I realized it was an intermediate length action...and the 35 Whelan won't feed from such a thing,, at least not with a lot of work.. Finding a bolt w/extractor shouldn't be too expenseive.. Good luck on the project, I love the Swift and have 2 just now. One a Ruger No.1V is a wonderfull piece if not the most accurate I've ever owned..It needs more load work, I think.. The other was a Pre-64 M70 that had a trigger job at some point. The job was incorrectly done and the safety was made inoperable. Because of that I got a great deal, but still have to fixed the problem, so don't know how it shoots..
