system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it possible to snipe someone from 2000+ meters away?

I'll admit that I just watched American Sniper and became curious about long distance sniping. With all of the factors that must be accounted for (wind, gravity, etc) how is it possible to hit a person with one shot from that distance?
gpt
Practice, practice, practice.

They have to take into account lots of variables -- *wind speed/direction, gravity, size of bullet, explosive load of bullet, distance to target, curvature of the earth, rotation of the earth, and several others* -- in order to make a successful long-range shot. 

They also have spotters with them to help range the target and establish wind patterns. The spotters also track the shot after it's fired and give data on where it hit, so that a second shot can be adjusted for better accuracy.

Again.... practice, practice, practice.