An old school trick to see if it has a full choke is to see if a dime will fit in the muzzle, if it won't, it's full. Even so, it's best to hang some paper up at the intended range and see how it does. I think the standard is 60% of the pellets in a 30" circle at 40 yards for a full choke, but I could be wrong.
I'm sure a collector would love to trade you for another shotgun if you just want a turkey gun, though.
Phillip McGregor (OFC)
"I am neither a fire arms nor a ballistics expert, but I was a combat infantry officer in the Great War, and I absolutely know that the bullet from an infantry rifle has to be able to shoot through things." General Douglas MacArthur