i hope you saved the brass . look at it carefully look for scrape marks on side wall .unusual primer , pierced or cratered . ejection marks on the bottom. looks like shiny circle stamped into bottom of brass . all these things are indication of over pressure . also split necks . if the bolt came out easy then it sounds like extraction issue . possible primary extraction issue . did it run other ammo well again . need to identify right issue to start on solution .