Stock fit is crucial. Your eye must center the sights right away. Take this test: Put a thumbtack in the wall. With rifle in hand, step back and focus on the tack. Now close your eyes, quickly shoulder your rifle, and open your eyes as soon as the comb hits your cheek. The sights should be on the tack. If not, the stock comb may need work, or the sight may need repositioning. Sometimes you can speed up your shot by shortening the stock, especially if you wear heavy hunting clothes.