With the depth of knowledge here I'd thought I'd throw this out to you guys.
I've come across a Savage 440 O/U. Owner says tight and in very good shape. Barrels are 27" (I'm guessing 28"). When I asked about the chokes he said there's none. I asked if the barrels are marked as having any choke he said no, it's a field gun. Doubt the bores are cylinder, right?
Anyway, google doesn't come up with much, only it was made in Italy by what is now Fabarms. Looking for something for 5 stand, sporting clays and some skeet. Have never owned a O/U. Worth buying in the $500 to $600 range?