If this is the first time you've used the rifle, it might be worthwhile having someone check out the headspacing. I've had two of these rifles and both functioned 100%, but I'd had other people tell me that some of the guns were improperly headspaced. Maybe incorrect matching of rifle and bolt? Never had a primer pop out of the pocket. Only problem I ever had with with milsurp ammo that failed to extract and I broke the extractor pulling on it repeatedly. Probably an excessive pressure loading for that gun.