On thing you need to consider is the heigth of your shooting bench and stool. Whatever you're sitting on should be high enough that your lower legsgo straight down from your knee with your feet flat on the ground. The bench should be high enough so that when you address the gun your back is nearly straight - not hunched over. If you're shooting from a set-up that requires you the bend down a lot to the gun, you will be amazed at what a more upright position will do for you.