I'm gonna say something that may not be traditional advice. You mentioned a youth gun so I'm guessing it's for a youth. The choke should depend on several things.
One does the youth shoot well? Can they shoot under stress? Can they shoot a really tight choke under the stress of not wanting to miss, blow a chance or let dad down?
My daughters have both shot turkeys, one by age ten the other 13.
The older one shoots well and had more experience. She shoots a turkey choke. The younger one shoots pretty well too but being she's so new to hunting itself I keep her shots under 30 yards, often 20-25.
Now a mod choke w the right shot (smaller size) fits that bill. I'd rather work a bird closer or have her pass a long shot than have a super tight pattern cause a miss at close range.
Remember there's lots going on for a kid, no matter the experience.
I teach Hunter Ed n hear tons of guys mention kids that shot real well blow easy shots. Something to think about
