Another thought would be to buy and install the correct cylinder. I've seen them for not too much money. Many of the revolvers brought in and sold as surplus before the GCA of '68 had the cylinder chambers lengthened for the special, thinking they would sell better, but were notoriously inaccurate with the under size "special" bullet.
Lee Harvey Oswald use one to murder Officer Tibbets. Conspiracy buffs insist it was an "assassins" gun, since little or no rifling marks were on the recovered bullets. No, it was simply a poorly conceived attempt to convert a good revolver.
Mark