there should be a small square button found just ahead of the trigger guard on the bottom of the rifle.push that in while withdrawing the rifle bolt back.
Actuate the bolt to the rear and there is a tang in front of the trigger that hangs down..Press up on this tang and pull the bolt back and it will remove it from the action.
To disassemble the bolt on a Remington Model 721 rifle, first ensure the rifle is unloaded and the safety is engaged. Then, remove the bolt from the receiver by pulling the bolt handle fully to the rear and pressing the bolt release located on the right side of the receiver. Once the bolt is out, you can disassemble it further by unscrewing the firing pin assembly from the rear of the bolt body, allowing for access to the firing pin and spring. Always refer to the manufacturer's instructions or a gunsmith for specific guidance and safety precautions.
I'd get in touch with Remington. They can tell you. I would expect that it's possible, as they should be pretty interchangeable, however, it would be unlikely.
100-400 or so
old, obsolete rifle, bout $300 US if its in good shape
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.
You can request a owner's manual at the Remigton web site.
100-300 USD depending on condition.
The model 721 was produced from 1948 to 1962
I just purchased a model 721 in 300 savage caliber and paid 325 dollars for it.These are fine examples and mine shoots great.For the money you are getting a well made rifle and piece of history.Enjoy it my friend.
The Remington Model 721 in .300 H&H was manufactured in 1948 with a 24" or 26" barrel.
If it is in 100% new condition and unfired, it could be worth around $700.00.