Well after lurking for a while and running through search lots of searches, I picked up my first rifle 2 weeks ago. Took it to the range for the first time today but forgot a stapler so I could really sight my scope on paper, and decided to wing it. I started shooting Hornady custom 150gr sst and somehow managed to chase the impacts down myself and put them on steel at 300 yards. Life was good until the 9th shot, I unlocked the bolt but could not get it to come back. After wrestling with it I managed to pull it back and eject the brass. At first I thought it was a fluke, but on the 12th or so shot it did it again, and again on the 17th. On that try I got the bolt back but the brass was still in the chamber, I managed to get it out after closing the bolt and wrestling with it some more.

Once that box was finished I switched to 168gr nosler match and all worked flawlessly, so it has to be in the ammo. What do you all think?