I have a 700 7mag that after the 1st shot outa the box, the bolt would rotate upwards but no luck pulling back to eject the spent shell. I had to use a rag and gentle taps with a hammer to release the bolt. Was using hornady superformance 139 gr GMX. Was told to think twice about using those higher velocity rounds so switched to reguler remy core lokts ending up with the same results. any advice or remedies would be appreciated.