I am wanting a smooth bore flintlock in 20 gauge. I have located a Bucks County smoothbore with a turkey choke barrel by colrain. However it has a 38 inch barrel. Is there much difference between this and a 42 inch barrel. First smoothbore I will own. Do not want to make a mistake.. Will use it for hunting turkey, crows, ducks etc. If there is a difference what would it be,