I've only done it once, with several other American writers and a couple of Englishmen, one of whom was Roger Mitchell--then managing director of H&H. I asked him how well one should expect to shoot on "proper" driven birds. 1 for 3, he told me. That didn't sound like much of a challenge to me . . . but I found that it took my getting into a very nice "groove" on the last drive of the day to put myself in that ballpark. The birds we shot, for the most part, were not unusually high. But the right combination of terrain and vegetation (trees) means that even "normal" driven birds will be a good bit higher than the roosters you'll shoot when you're blocking on a pheasant hunt in South Dakota.