Not that I know anything about reloading, on the basis that if the Queen didn't stock it, I didn't shoot it but knowing a bit about brass then surely, if the brass - any brass - is annealed fairly frequently after being subject to the extreme and almost instantaneous temp change then it could be used indefinately. So long as it hasn't started its natural structural breakdown to constituent parts of course. JM and Paul B, you're the metallurgists........ what say you?