Congrats on the new gun. I also set my youth 870 up for my daughter. Will be purchasing a 26"barreled 20 gauge 870 whenever I get a day off this fall. Like yourself, no experience with longer barrel yet, but a friend has had good luck with the Jellyhead Max. I have several 20 gauge Rem chokes, so maybe I can be more help to you in a month or so.