I may burst some bubbles, but here goes.....
Movies rarely, if ever, show the actual view one sees looking through optics. Binocular views typically show two round images superimposed with a 25 to 50 percent overlap; in reality only one round view is seen looking through binoculars.
Rifle scopes are great for visual effects. I've never seen one in a movie that looks like anything I've seen through a scope. Unless the rifle's held perfectly still (never happens with it against the shoulder) there'll be a vertical semi-figure-8 shaped wiggle of the reticule about the aiming point due to pulse beat. Shooters are alive with beating hearts when they aim, aren't they? No movie view through a rifle scope shows that.
Movie's objectives are visual and acousitc wonders for our eyes and ears; reality is way down the list. Use a ballistic program to check out the bullet drop per yard of downrange travel and wind drift for a 1 mph crosswind a 300-gr. bullet has shot from a .338 Lap Mag when it's 2100 yards away; drop = 4" per yard, drift - 30" per mph. Then couple that with the 21" best accuracy circle at that range any rifle will have along with the rifle holding variables we all have and the amount of recoil that rifle has while the bullet goes down the barrel which disturbs accuracy. To say nothing about the atmospheric variables that have to be considered. Then the first shot probability of hitting someone above the chest will be realized when shoulder fired rifles rested as shown in the movie adds about 1 MOA to the rifle and ammo's best accuracy.
Ever watched 50 of the best long range competitors on this planet fire their first shot at 1000 yards with known zeros for their stuff held against their shoulder then note how far that bullet strikes from target center? Most folks won't believe how often they miss the 10" diameter X ring on the USA long range high power target. Sometimes, they don't even hit inside the 20" ten ring.
Best on-line article I've seen about Chris Kyle, Chief Petty Officer, USN:
http://www.dmagazine.com/publications/d-magazine/2013/april/the-legend-of-chris-kyle-01?single=1
After seeing the movie, I though back to the early 1970's when the USN SEAL managers asked my detailer in the Pentagon to release me from a shore based training command to them to be a sniper in Viet Nam. Very glad he didn't as I would probably not liked it all that much.