Lead is the actual answer, it's just perception of it of course. Perceived lead may not be the answer for some people, because their method involves moving at a greatly different speed to the clay, so they are pulling the trigger before the lead is correct (and allowing for that fraction of delay it actually takes to pull the trigger and activate the shot). Chris Childerhouse often talks about shooting behind a clay to hit it, because he is moving so fast that the muzzle has moved on from what he sees, once the shot is released. I like to eliminate this variable as much as possible. I pull away from the clay, match it's speed and hold a static gap which I can really see. This stops timing problems and helps me repeat the process. (I don't always get it right of course.. but to me this is the least risky way of shooting).