The Federal HW loads will flat out get it done. If you don't want to spend that kinda money on shells, most all the lead loads will too at that distance. I killed loads of birds from age 8-12 with a little 20 guage Remington 870 Wingmaster shooting 2.75" Nitro Magnum #4's.
Just make sure whatever you decide on, the patterning board is the main test that should help you get there.