Once shell is chambered, it is sometimes very difficult to unload the gun. The shell seems to get stuck in the chamber not allowing the bolt to be cycled. I'm using new estate shells. Does anyone know if it is possible and how one could polish the chamber so that the shells don't get stuck? The gun fires and cycles fine. Problem only exists when trying to unload manually. I had a previous post on the matter and appreciate all the advice and have found this to be the problem. Thanks, Jason