Sorry to maybe get off topic but it appears that the 25 stevens rimfire uses the same bore dia. (.251) as the 25 auto. Anyone ever convert a old stevens to 25 acp? Its possible that the semi-rim of the 25 auto might just be enough to headspace. So that altering the firing pin may be all thats required. According to COTW, Rem. and Win. also chambered guns for the 25 stevens.