Hope someone can help me out. I have been given quite a few once fired AAs in 12 gauge. A lot of the hulls have coarse edges around the around the base. I,m not sure if the were picked up with some sort of machine or not. I'm wondering if these edges will damage my reciever. Thanks for any input, I would hate to throw out a few thousand AAs but do not want to have a problem with my gun. Mike K.