The finger is shaking...thus causing the gun to shake..........but only when pressure is applied. I get the same thing when I take a picture with a camera...pressure against the button I get a shake. I do have the grip master to practice with but still same. Yesterday I shot at 15 yards keeping 126 shots out of 150 in an 10 inch ring the other 24 still on the paper. With the shake I am trying to force the shot before it is clear.