While yours does have a heat-treated cylinder, for a .32-20, it makes no difference. There is a lot of steel surrounding the chamber holes, far more than needed to contain the pressures of firing a .32-20 cartridge even if made of softer steel. Most who shoot any guns in .32-20 find it is a good idea to load their own. Reloading components (cases and bullets) are more easily found than loaded factory ammunition. It is an extremely nice specimen, far better than most. Take care of it and keep it that way. The only concern I would have is the originality of the finish. It could well be a factory re-blue.