I can't really say much about shooting quail, as I've never had the oppurtunity to do so. But for shooting pheasants, #6's through a modified choke at 30 yds. will work well. Later in the season when, most birds are more mature and perhaps somewhat spookier, I would think about using the 5's. 2 3/4" would be fine. Just be sure you get the 1 1/4 oz., 3 3/4 dram equivalent loads. Good luck to you.