RE: Bolt not closing???
LA, It may be that some of your cases are a bit long and the crimping portion of your seating die is deforming the longer cases. That would be a new one on me. Usually, cases deform at the top of the case at the shoulder junction if they deform at all. Check your case lengths and trim as required.
You also may want to chamber each round after sizing to make sure they fit at that point. Try them again after seating a bullet. If they won' t chamber then, it is surely the seating die. There is always a reason and a solution. Good luck.