I have killed a 15 bird limit of doves with one box of shells a few times but I can't do it consistently. Most of the time I'm about half way in to that second box before I'm done. For me, shot selection is the key.

Now, when I went to S. America, my bird boy claimed my average was about 71%, but they are very generous. You cut one feather and they count it as a shot bird. They want to keep the clients happy.

Nothing the government gives you is free.