As many times as you can, so long as they are safe to reload and function efficiently. There is no specific number of times that you can reload brass shell casings. The number ranges from 5 reloads to 10 or more. If you trim and anneal the brass after the 4th shot, load light, and don’t have an over-sized chamber, you will most likely get more reloads from the best shotshell reloading press.