Maybe I just haven't found this yet on the site, but here is a link to the barrel date codes Remington has used since 1921 to designate month and year of production. Before 1921 the serial number list I did find is useful, but after this will give a more accurate date for any Remington model since 1921. Serial number lists are model specific. Try it and possibly put it in as a sticky here on the forum.
http://www.remingtonsociety.com/rsa/que ... arrelcodes