So my friend has some steel targets that seem to have lost the ability to ring when shot. He's had them for about five years. When we first started shooting them back then they were plenty loud enough. A really loud, high pitched ring. It seems like over the last year or so though the tone has gotten much lower. One is a 12" × 20" silhouette and the other is a 10" inch gong. They're hanging from a metal bar with four metal legs.
Has anyone else had this happen? What causes it?
Has anyone else had this happen? What causes it?