[Pa_Shooter]

I may be asking something previously asked but I need to see if I am right. I am reloading for a 243 POF Ar-10. I loaded 4 different loads from the Lyman Book for different grain bullets. I did it all as per the book, shot the loads, came back from the range and put all the brass in the tumbler. I resized them, cleaned all the primer pockets and primed all of them. Half of the brass had primer pockets that were way too big, the primer went in with no resistance whatsoever. I know that an over-pressured load will do this and I have heard of magnum primers sometimes doing this but I uses CCI 200s so I know thats not the problem. Anyone with some ideas??