There are many reasons as to why a Decapping Rod may break and without us being there watching you reload, there's no way for us to positively diagnose what caused your Decapping Rod to break. The most common reasons being Berdan primed cases, military primed cases and when the Pin hits the side of the flash hole. We have also seen some newer cases where the primer hole is drilled off center, which of course will then hit the case and bend/break the Rod. Another common culprit of broken Decappers is foreign cases that have undersized flash holes. These cases can either cause your Pin to break or pull the Pin out of the Rod. Whatever may cause your Decapping Rod to break, you are always welcome to return the broken Decapper to us for a no charge replacement.