I got a pellet of #7 steel in a rooster once. I was actually out for woodcock but thought I might jump a duck at close range, and plus I just had #7 at the time. I didn't expect to see pheasant. Well, the pheasant flew a few hundred yards after I shot it, I went to where it was and it flushed again, without a shot, and then searched for it, finding it another 50+ yards away where my dog caught it on the ground as it tried to run away. At first I thought that I missed given his behavior after the shot, but when I opened it up there was a single pellet with pretty poor penetration in the breast. I will be using bigger steel shot in the future if there is any chance of pheasant.