Doves are hard to hit -- They are NOT particularly hard to kill. Use a light, comfortable load to hunt with. You could end up shooting a lot of times to get your limit. A shell to bird ratio of 8 to 1 is not unusual. In South Carolina, public dove fields now limit each hunter to 2 boxes of shells to attempt to curb "sky busting." The bag limit is 12 birds. If you pick your shots, you can limit out with 2 boxes of shells. The real shooters will use more like one box. I have seen a hunter run 12 straight, but that is a very rare event in dove hunting.
Now forget about optimizing your load. Install the Improved Cylinder choke tube in your gun. Get a camo T-shirt and a pair of shorts, a dove stool and plenty of sunscreen, insect repellent, and drinking water, and head out for about the most fun you can have with your clothes on!
Clemson