Before you attend a driven day’s shooting, you should have a good idea of what is considered a sporting bird, what is unsporting or dangerous, and what is out of range/beyond your ability.
As a Gun you will typically be positioned 40-50 yards from the next peg. In most circumstances, shooting (at) birds flying over a fellow Gun is considered poor manners. Be selective and, when safe to do so, always do your utmost to dispatch birds with your second shot that have been wounded or ‘pricked’ with your first.
Respect for the quarry is key. Read more here