Got to thinking about the physics of shotguns and how they apply to this....don't know why, just did....

1. the pattern out of our guns is an infinetly increasing cone, the closer you are the smaller it is. Restated, it's much easier to miss at 5 feet then 25!
2. almost all shotguns are regulated to shoot above the point of aim (built in compensation), most hunting guns are 60% above point of aim, some 70% hell trap guns can approach 100! So DON"T AIM HIGH! you'll miss. How many people know of a road chickens missed by this technique?
3. pattern your gun at various distances so you know!
4. if you can wait for the ducks back to be to you it is the most vulernable kill site and best chance of keeping the meat unaffected...

Add as you wish...