I saw it happen once , after seeing that I carry a stuck case remover . I thought it was from oversizing and hot loads . I stay away from both . The head of the case was on the bolt face an the case body was stuck in the chamber . Someone at the range knew I had the tool in my range bag , the guy luckily had a 308 ,the tool worked great , fed it in like a round , pulled back on the bolt an out came the case body . Great tool to have in your range bag .