Originally Posted by Hardyreels
Water load the rod and use a single back cast. Allow the back cast to straiten out and then let it fly. Practice with positioning the line prior to the "water load" will help you to make the presentation cast where you want.
This is how I cast big flies on my six wt (up to 4xlong 1/0 weighted and dumbelled
), the most important thing is that the line is strait on the water, you start low and gain speed through the back cast untill it stops and is strait to give the best rod loading
also try a sinking line. At 40' even an intermedate line will out fish a 5' sink tip