Clean the chamber and bolt. It could have grease or other preservative in there. There is sometimes a little resistance, but it shouldn't be difficult to close the bolt.
You could have an ammo issue rather than a rifle issue. Trying another brand of ammo could solve your problem.
Do you have a scope mounted on it? With most scope mounts on a Remington they use longer screws on the rear receiver bridge. It is possible to get them reversed and put the longer screws on the front of the receiver. When this happens they come through the receiver and hit the bolt when you try to close it. Look inside the receiver and see if the scope mounting screws are protruding inside the action.