I'm gearing up for my first-ever spring turkey season. I own a Mossberg 500 in 20 gauge with a 26" barrel. I have been looking at various chokes on different websites (the local cabela's doesn't seem to carry turkey chokes in 20ga), and am really confused as to what is what. Right now I've just got a full choke in the barrel, and have been shooting target loads to get a feel for how the shotgun handles (first one I've owned). Obviously those won't take down a turkey (especially with #8 shot and a 12" spread). I know ammo selection goes by what your weapon likes to eat and the specific shoke you're using. However, are there some general guidelines on what to look for in a turkey choke? Ported versus non-ported? What types of shot cannot be fired through a ported choke? Any choke brands that are an absolute do-not-buy?