Are you using a picatinny rail mount for your scope?
Check the front screw to make sure it isn't interfering with the bolt position.
Remingtons and Savages are notorious for this, as they tend to place the front scope rail mounting hole right in front of the barrel and chamber. If you use too long of a screw to tighten down the rail it will obstruct your bolts operation.
A lot of people think that it's an ammo issue, when actually their front scope rail mounting screw is blocking the bolts path.
If everything is in order ... check this off of your list. I always look for mechanical problems before moving on to ammo related issues.
