Sniper Rifles

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http://patdollard.com/wp-content/uploads/2013/04/AS50_sniper_rifle.jpg


Sniper Rifles are like long rifles except they have a range that dwarfs the standard hunting rifles. The standard sniper rifle range is 800 - 2400 yards (732 - 2200 meters).  This is not only due to the rifle, but also has a lot to do with the person behind it.  The design of these is quiet a bit different.  They are designed to help dissipate the force generated by the amount of gun powder needed to accelerate a round to that kind of velocity.  The range on these firearms is so great that there are many different variables that have to be taken into account when making a shot. 

Any good rifle hunter will tell you, "never shoot at a moving target."  You are much better off waiting until the target is stationary to take a shot.  However the men and women of our armed force do not always have the luxury of waiting for a stationary target.  As such the variables that need to be accounted for by any shooter have a much greater effect.  Imagine a small plane that is trying to get from point A to point B in a straight line.  If the winds kick up, then the pilot has to make adjustments to their course.  The same goes for shooting long distances.  If the wind starts to blow before the shot is taken, then the shooter can adjust to the new circumstances.  This usually requires a shift in position, but sometimes can be fixed by aiming to either the right of left of the target accordingly.  So now that distance and windage has been accounted for there is one more thing that must be taken into account in order to make sure all of the basis are covered.   The Coriolis effect, the spin of the Earth, starts to come into play when the bullets are traveling such a distance that the position of the Earth moves under its intended path.  As slight as this shift is, over the mile or so that the bullet is in the air, it can make the difference in hitting your target or missing completely.



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https://www.buffalobore.com/images/eb_S308175_2900fps.png





http://www.cybersniper.com/bulletdp.gif

http://www.cybersniper.com/bulletdp.gif


These trajectories are only out to 1000m.  Most measured ranges are 800m (875 yards) long.  These, however, show how much correction must be applied to a shot in order to hit the target at a particular of range. 

Confirmed by GPS, Craig Harrison (UK) of UK's Household Cavalry killed two Taliban insurgents from a distance of 2474m/2.47km (8,120 ft or 1.54 miles) in November 2009. It took the 8.59mm rounds almost 3 seconds to hit their targets, which were 914m (300 ft) beyond the L115A3 sniper rifle's recommended range. A third shot took out the insurgent's machine gun.  The rifle used was built by Accuracy International, per the Guinness Book of World Records.


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http://www.raf.mod.uk/rafregiment/rafcms/mediafiles/CEEF18E8_1143_EC82_2E4CF4A6B41EBEEB.jpg