Home Forums Reloading Big Game Rifles 30/30 primers backing out

I have seen this many times with factory ammo out of low pressure cartridges. The 30-30 more than any other. You could really clean the chamber and maybe the cases would slide back and reseat the primers. Usually what happens is the firing pin hits the primer pushing the case to the front of the chamber, the primer fires, pressure pushes the primer back to the bolt face and then the case slides back to reseat the primer. I have seen many somewhat rough or dirty chambers cause the case to "cling" long enough that pressure drops past the point of sending the case back to seat the primer again.