if the brass is seriously corroded, or the paper is swelled enough that it is dificult to chamber, chuck it. other than that, shoot it. WEAR EYE PROTECTION though. if a case does split, you do not want the hot gasses coming back a hurting your eyes. it will not "blow up", but if a case splits upon fireing, it may make you cleaning a little more of a task. if you get a lot of case splitting, i would just chuck the ammo. it is not worth all that hassle if most of it is bad. as for disposal, most law enforcement agencies can dispose of bad ammo for you. call them up and ask. that way, you avoid burrying it and poluting mother earth. r worse, have a dog dig it up and chew on it.