I traded two project guns at the gunshow this past weekend for a 1912 Steyr M98 Mauser (yes, cock on closing). It was an import through Century and barrel looks unfired though it is now a 308 - NATO stamped on receiver underneath the crest. The stock looks as though it went through our civil war. I may want to convert it to 8mm using a surplus barrel. Anyone know whether it is a large or small ring?