if its smooth get a tube installed ! get a rem choke if bbl. dimensions allow and then you can have a turkey choke and rifled choke ! you can also do the same with browning threads but at a higher cost !
and before saying a rifled bbl won't shoot shot read what browning advises about their rifled barrels and also check out the cape gun ! both go against conventional wisdom ! ( i tend to agree with earlier post , just food for thought )
SHOOTALL,
Have you got links to this information? I have a feeling they are talking about straight rifling that keeps the shot-cup from spinning, not a twist rifling.
I have a White Thunder 12ga that has a Hastings WadLock barrel that uses this straight rifling, it is very effective at controlling patterns.
A few companies also make straight rifled choke tubes for smooth bores to insure the shot-cup is not spinning when it leaves the barrel.
Of course a twist rifled barrel will shoot shot, but unless you want to hit everything around your intended target, you won't be happy.
Please show me the information you speak of, I would love to read it.