RE: 12 gauge 3.5" or 10 gauge what do you perfer?
Most of the 12ga 3.5" waterfowl loads have almost identical velocity and shot volume as the 10ga loads. Look at the Cabelas Waterfowl catalog and compaire the shot volume and velocity of the two. The 3.5" 12ga is as versital as you can get, with 3 shell lengths and many more load variations than the 10ga.