The calibre, brand of brass and powder loads used may determine the signs of replacing brass. I have used 243 brass so many times that neck is worn so thin I cannot get a tight bullet fit, and there is no other signs of deffects.
mysticplayer said:You are looking for shiney rings around the case head, bulges, splits, loose primer pockets, excessive case length growth (has to come from somewhere and that is usually the web).