Request an owner's manual from Remington on their web site, it's free.
it is below the feildmaster logo
You can request an owner's manual for free at Remington's web site. 10
50-150 USD or so
All Remingtons made from 1921 have a date code stamped on the barrel. The details and table can be found on the Remington Society of America, Manufactures Link.
Check date code, see related links
go to Remington web site they can help you as they did with my 870 wingmaster
Depends on condition and wheather its a BDL, it could go from 125 low side to 450 high.
Check the barrel codes on the Remington Society of America. http://remingtonsociety.com/rsa/questions/barrelcodes
The link gives barrel code location and tables to look up date.
It's date code stamped on the barrel, see related links for information on the Remington Society of America.
1954 -- just google pat. numbers then go to first listing