When opting for 20 gauge ammo for shooting clay targets, check with your shooting club. Many clubs require shot sizes of #7 ½ or smaller. In some cases, #8 shot may be a better option, especially if firing from a close range. Most clay target shooters opt for a 2 ¾ inch shell over the three inch. Because you’re not worried about stopping power, the extra power is unnecessary and even restricted at some clubs. Many ammunition manufacturers makes specialty target rounds including Winchester, Remington, and Federal.