RW Hart makes a gizmo that you beat with a hammer that has fairly good results in fixing loose primer pockets. It does not make them like new but from what people say if you pound them pretty hard you can get a few more firings out of most cases. I have been thinking about buying one.
http://www.midwayusa.com/viewProduct...tNumber=339607
Of course for belted cases when you have blown the primer pocket you often have expanded the case right at the belt and Larry Willis down in Florida makes a gizmo for that. I also make a version for myself by cutting in half a full length die and grinding a little off the base so it will size all the way to the belt.
http://www.larrywillis.com/