I don't care what is used on clay targets. However on birds clean kills matter to me. Mostly I hunt Gamble's and Scaled quail, Huns and grouse. Favorite load is 20ga with 3/4oz or 7/8oz of #7s. Just enough heavier to get good penetration and that is what kills birds. Gamble's and Scaled quail have a tendency to take a good hit and once they bounce on the ground to come up running. But not so much with 7s.