Just a heads up, i needed some A-STEEL powder today so i went on a recovery mission and opened up my old air rifle B loads that ned talked me into loading years ago. All the shot inside was rusted up. These never left my shell cabinet, and i have never seen another shell rust (i keep it at 55% humidity). So if you have any of these laying around, id check them. Mix of copper and silver steel rusted, the copper was worse.