Hankrt seems to have hit the nail on the head. 5's will work just fine for pen or wild birds. It is a rush to have one get up at your feet, but keep your nerves and dont get flusterd. Shoot on instinct, don't overthink your shots. Good Luck!
The life cycle of a hunter... hunt, eat, sleep if there is time, then go hunt again.
Chuck Norris doesn't go hunting, becasue hunting infers the possibility of failure. Rather, Chuck Norris goes killing.