The only thing this .38-55 could be rebored to would be custom chambered calibers. There have been some rebored to .40 caliber to create a .40-55, but then you'll need custom reamers, and custom dies. No time or money saved there, so not a good option to me. It only saves putting a liner in the barrel, and I'd rather line it back to original caliber to keep it's value higher.