Recently I saw someone ask a classic question: how does the bullet hit the target when the sniper gun and the scope are not in the same line?In fact, the scope and barrel are not only not in line, they're not even parallel, they're just close to parallel.If want to hit a target, the scope needs to calculate and adjust the Angle based on the shooting environment, including the target's distance, current temperature, humidity, wind and other factors.
From the point of view of physics, due to the influence of gravity, the bullet does not fly in a straight line, but in a regular parabola.If the scope and barrel are straight or parallel, the further away the target is, the greater the deviation between the bullet's actual hit position and its intended position.So the scope is actually aimed at where the parabola of the bullet falls, where the sight line of the scope intersects with the parabola of the bullet.Since the sniper gun and bullet are highly precise, the parabola of the same type of bullet fired from the same sniper gun is basically stable and the basic trajectory can be calculated.For example, the 7.62mm sniper gun has an effective range of about 1,000 meters, which means that a target within 1,000 meters can be shot accurately with the scope. If the range more than a kilometer,The sniper needs to calculate and estimate the adjustment according to the humidity, temperature, wind and so on of the environment. Because the farther the bullet travels, the more kinetic energy it expends, the more likely it is to deviate from its stable parabolic trajectory, you have to consider environmental factors.