There are three components of hitting a 300 yard drive in golf. 1st component is make sure that the top edge of the club should be below the top of the golf ball. The second component is making a complete turn in the back swing. The shoulder here should turn more than 90 degrees. The third component is to swing with tempo so as to maintain the rhythm and balance of your body. This step of the tee consumes more than 80 % of the potential energy of your body. So using these 3 steps you automatically ensure that the ball tees fine, turn your shoulder enough to generate the potential energy which you can use to the optimum level in the third step.