Try watching on GunBroker.com They have more guns up for auction than any other web site that I've found. It may take a little while for a particular model to show up but eventually it will. Another source is the Gun List newspaper that comes out 3 times a month.
The model 721 was produced from 1948 to 1962
The Remington Model 721 in .300 H&H was manufactured in 1948 with a 24" or 26" barrel.
General information on the 721 can be found on the Remington website here: http://www.remington.com/library/history/firearm_models/centerfire/model_721.asp
Your Remington model 721 was produced from 1948-1962. If you can supply the 2,or 3 letter code on the barrel we can pinpoint the month and year of production.
Depending on the condition (stock, metal, etc.) and the sights it has, anywhere from $250 to $600. Most average condition ones are in the $300-$400 range.
100-300 USD
around 500$
100-400 or so
1 in 10
100-300 USD
The made them from 48 - 62, they are date code stamped on the barrel, the location and chart is on the Remington Society of America.
They are date stamped on the barrel, see related links for information on the Remington Society of America.