Peter, the angular velocity of target relative to gun is a very small component of target movement at low 7. Nonetheless, I think a shooter with mounted gun has muzzle "inserted" ahead of the target by definition as the target is originating "behind" the gun. I just raise the the butt to shoulder and fire. Like everything in skeet, it isn't a sure thing if the bird stalls, dives, or curls outbd or inbd but statistical uniformity of the target appearance is generally maintained. I can't see that however much practised this leads to a correct appraisal of target path in the field, but it does reinforce a sequence of events in which the trigger pull very quickly follows the appearance of the "bird." Few people shoot low 7 as it settles past the out of bounds stake on the other side of the field. So there's a conditioned response available when a situation similiar (not identical) to the condition on the skeet field appears.
As I stated earlier, I don't always have the visual acuity or hearing to "jump" the sound of the trap and move ahead to a quick break of 2 high. (Don't think you're supposed to move the gun on the sound cue in International.) However, I have done it. More times than not I chase and not so much swing thru as "close the angle" after the stake. Apparent lead looks pretty small. Several nervous Mervs of my experience make their first "move" (whether mounted or not) a muzzle movement toward the house as they call so there's no question even if the target breaks that they're shooting a desperate swing-thru with high muzzle momentum no matter what they think they're doing.
jack
