That's not to say it's impossible to shoot good scores with a field gun. You can. I've done it, and seen it done a lot. But, it's a difficult way to shoot clays, and what often happens is, eventually, the good shooter with a field gun starts to miss and doesn't know why. Then he or she bears down, squishing their face even harder on the comb, which just makes the target even harder to see. A cycle of frustration, madness and despair follows.