Ok, this one is going to make me sound like a complete ignoramous, but I've not paid a bit of attention to chokes since I got my first gun 23 years ago. I'm now hunting w/ a hand-me-down Super Blackeagle - shooting ducks (mostly pintal and teal - and the occasionally teal that magically turns into a spoonie when it hits the water) I have no idea what choke is in it, although I know it is changeable.

Shooting 3" heavy steel, what is the preferred choke for this kind of hunting? I really should know this and am too ashamed to ask my hunting buddy that question...