I have a Savage 110 .30-06 that I bought 4 years ago. Within the last few months, I realized that after pulling the trigger, even if I dry fire it, the bolt is more difficult to open, than just closing and opening the bolt in succession. If I open it quickly, such as if I were in a hunting situation, I do not notice it. It is only when I slowly open the bolt and pay close attention. Does anybody have an idea what might be causing this? I have not shot the rifle very much over the last year or so, but from what I have shot it, it has been accurate enough, and my handloads are trimmed to spec, and loaded very modestly. I am at a loss.