A while back I had a problem with a batch of Winchester standard LR primers burning holes in the edge of the cup. The cups were silver. I thought at the time that I remembered Wichester LR primers in the past were brass colored. Seems I was correct. I had thrown all the silver ones away. Yesterday I happened accross some I had put away several years ago. They are brass and seem to be thicker than the silver ones that were blowing holes. Does anyone know when Wichester changed from brass to silver? Why? I don't have any of the boxes the silver one's were in so I can't compair numbers.