There is a chart at the bottom of this page: http://www.remington.com/magazine/history/m11_5.htm
1930 - it'll be date code stamped, look at related links for information on the Remington Society of America.
To look up the serial number of a Remington 7400 model in 30-06 caliber, you can start by visiting the Remington website or contacting their customer service for information on how to obtain the manufacturing date and details related to that specific serial number. Additionally, you can consult firearm databases, forums, or collector guides that specialize in Remington firearms. If you have access to a local gun shop or a certified gunsmith, they may also assist you in obtaining information about your specific firearm based on the serial number.
This will tell you how to look it up. http://remingtonsociety.com/rsa/questions/barrelcodes
1928 see related link to look up exactly.
1905
It'll be date code stamped, look at related links for information on the Remington Society of America.
You can look on remington's website, but judging by the serial number it should have been made in 1980.
Check the date stamp on the barrel. The table look and details are on the manufactured date link of the Remington Society of America.
1950, there is month/year date code stamped on the barrel, you can look up the code on the Remington Society or America.
Refer to related links to look up the barrel date code stamping.
go to: proofhouse.com & look up Remington weapons
Check the date code stamped on the barrel. Look for the manufactured date link on the Remington Society of America for details.