I have a similar situation with a vintage Rem. 870 in 16 gauge, choked full. Found it at a pawn shop, decided to save it from some dishonorable fate, plus I had shot one since age 14. I killed a gobbler on the run with it at 45 yards, it will kill mourning doves at 50 with handloads. My 14 year old son wants to shoot it, but choked like a rifle? Only reason I hesitate is that Remington reamed a perfect choke (using the definition of "full choke" as was intended) into this one and that skill is a dying art.