Currently we are only allowed to shoot lead rounds. We are looking for material to hang on the sides of the range that will prevent full metal jacketed rounds hitting something they are not supposed to. We currently have rubber blocks for the backstop that do a good job. But are sides are wooden( it is an old indoor range and we are saving up for a new one). Until then though we are looking for a company and the material that we can hang up on the side walls to prevent these bullets for going to who knows where. Any advice would be great thanks alot guys.