ive been a sniper for 6 years and you can know your rifle in and out. you will never know how the wind will be 1000 yard out as you cannot fill it only see trees moving through binos. you can guestimate as to what your angle is but being able to calculate it does give you an advantage. this watch does help with the basics but afor shots beyond 1000+ yards theres more too it than just windspeed direction and angle and bullet weight. heat from the earth surface affects it, gravity of course affects it and the rotation of the earth even affects it. so the watch will help out both non snipers and snipers a like. but it takes a lot more to hit the long shot.