Carl,
As an owner of both 25-20 and 32-20 guns I can testify that ammo and components for neither are especially available now, in fact if I were not a packrat and hoarder of old cartridge cases I could not shoot a lot of my guns. My best advice is to shoot it like it is, but it is your rifle, and you can do with it as you will, if you insist on modifying a useable original rifle, my second-best advice is to have it lined to 38 S&W Special and shoot abundantly available target ammunition loaded with 148 grain hollow-base bullets. Be sure to save your spent cases, against the day you decide to load your own.
Mike
