Hi my friend has a 30 cal rifle he bought from a guy at a gun show....we took it out and shot it yesterday.....what it did with some cheep ammo was poke out the primers on the spent shell and chambered a new one with the spent still attached to the bolt.......what do you think the problem might be....This happened everyother shot or so...we are thinking firing pin return spring ?This is are first 30 cal...who knows how many years it has been since its been shot....I will get back to you guys with the manufacture on it....Thanks Dale