I found some cases at the range took them home and put them in media cleaner. They had to be old because of the tarnished exteriors and the tumbler obviously didn't bring them back to a high shine. Went ahead and loaded and went back to range to shoot and many of the older cases would jam. I checked overall lengths which were within .050 either way.If the cases don't look like brand new does this create issues? The older cases had no dents or impressions what went wrong? Other loads out of same batch worked they were the real pretty ones. Helppp