Then I think I got a choke that will give him some distance,yet allow him some versatile options for waterfowl to grouse.
He can use up to BB shot ,with 3in shells for waterfowl too with the extra full .
Most 3in shell are right around 1550 velocity. Which is the longest shell the gun can take.
I've never bought chokes ,and had to deal with all the little technical stuff. I got the right threads,size,all that jazz.
Now I have to wait till middle of March for the boy to take it out and pattern it.
This is what carlsons website says about his choke.