in doubles, most of the time, there is very little variation to where the birds go. By chosing a spot in the background for reference of the bird before just went you can position your gun to where you have very little movement to break the first bird. I have found for myself that if I position my gun just outside the first bird area and make a swing towards my second bird, and break the 1st bird on the way to my secong bird. Also a little thing that helps me,if I am constantly shooting over the second bird I can bring my forearm hand back closer to the receiver, this makes the front of the gun heavier and harder to shoot over the second bird, likewise if I am low on the second bird I move towards the front of the gun which lightens it's movement and makes coming up into the bird a little easier. Practice! Visulize and Practice! Almost forgot ! most important is to stay in the gun!