The really old AAs were a one piece hull. Ever since they went to a two piece hull I haven't really noticed the difference shooting-wise, but I have noticed that the new AAs eventually split down the side. They malfunction in this manner before anything else for me. I just shoot them one more time (if I have already reloaded them), then discard them. You shouldn't have any difficulty pressure -wise, Gil, if you stay within the safe standards given in your reloaders manuals. I still have a whole garbage bag full of the old AA one piece hulls out in the garage and I am saving them for what? And probably a thousand+ once or twice fired AAs, STS, Nitro, and Federal. I just load them all the same way and shoot. Never could tell the difference.
