Back in the early 1970s I got a case of the early 28-gauge AA  Skeet loads from Bower Wholesale in Los Angeles.  The battery cups of the primers were punched off-center leaving a lip that didn't set down in the recess around the primer pocket in the brass case head.  With that lip standing proud on the face of the shell head a gun couldn't close on the shells.  I took the case back to Bower and they gave me another case that we checked didn't have this problem.  They said they would be sending the defective case back to Olin, but I never heard any more about them.  Certainly have never had that problem with any other Winchester/Western shotgun shell or primers.