I've used my very limited google-fu skills(unsuccessfully) to find something that resembles a wax/lead type slug but substituting JB Weld in the place of the wax. I've watched Taoflaedermous's videos of different jbweld slug types and shapes but have never seen anyone take the original JB Weld and pour it into a load of buckshot and let it harden up. Or better yet take the buckshot load and place it in a cylinder and pour the JB in to harden around the balls then load it back into the shell.
Anyone here try this?