I recently bought a new 700 sps 7mm rem mag. When I took it to the range the first time I was using factory Winchester 150 gr ammo. When I fired my first shot I lifted the bolt with no problem but couldn't pull the bolt back to extract the case. This happened on every shot so I quit after only five rounds. I later tried factory Hornady loads and they seemed to work just fine. I was wondering if anybody else has had this problem? I do reload but have not gotten my 7mm dies yet.