From Gun Digest...Nov 2012. More and more ammunition makers are going to no-lead bullets. Investigators can reconstruct most crime scenes because they know how lead bullets perform. Many investigators have no idea how lead free bullets will react when fired into different mediums. Michael Knox, crime scene investigator for Jacksonville, Florida. Dr Sigman, National Center for Forensic Science states that ammunition makers are not replacing lead with another universal material!!! each Manufacturer is using their own combination of metals and materials. And they are not sharing that information. It's considered proprietary information!! FYI.