The first one is a little more complicated. Mainly because of the limitations of the characteristics of optical sight instruments. Any sight without objective focusing or internal focusing, after the installation is successful, there is no parallax at one point. For different distances, the parallax will be large or small. General fixed magnification sights may not be complete. It has the function of adjusting the parallax. This is mainly because in the long distance, the error caused by the parallax will be less than the spread of the bullet itself. In the area of frequent shooting, the factory will select the most commonly used shooting distance point to set it as a non-parallax point . GA4X32 has no parallax zero point at 35 yards.
In other words, after correction at this distance, as long as the shooting posture is correct. The gun must be accurate.
On the other hand, if the correction is outside this distance, if the eyes are deviated from the top, bottom, left, and right, the bullet will fall. It's just the size. Sometimes it can be ignored, unless you are playing an international game.
Detailed articles about parallax can be found on my website.
The second category is zeroing on-site target sight.
It is mainly used for police or fixed-point and fixed-range sniper, such as knowing the target's distance and launch angle in advance.
Select similar or consistent areas in the shooting range and conduct targeted calibration.
For example, the special police received a notice that a suspect was taking a hostage in a certain district. The best sniper position is 170 meters away from the suspect, located upstairs above the opponent, with a height difference of about 23 meters.
At this time, the special police will calibrate the sights and determine the corresponding distance first, because usually in the shooting range, the guns are all calibrated at 100 meters. At 170 meters, the impact point will be high and low. deviation. At this time, the sniper should correspond to the crosshair of the sight exactly at this distance, and make sure that the bullet point is exactly in the middle of the crosshair when shooting. Then press the height difference and launch angle data. Adjust how much the bullet is higher than when shooting down from the plane (upside and down shot, at medium and short distances, the trajectory is slightly higher than when shooting down)
After calibration, you can go to the scene.
This zeroing method is targeted. In actual hunting, you can use it in this way. For example, if you often hit things on the ground, you can hit a fixed target on the ground. If you love long-range shooting, you can hit a far target, and hit the center point of the sight to correspond to the impact point. If you love close shots. Just align the center cross of the sight with the impact point of the common distance nearby.
The third is to return to zero the direct firing distance of firearms.
This is also one of the commonly used methods of zeroing. The main thing is to first look at the bullet’s outer trajectory, whether the bullet’s trajectory is curved or low extension, and find out the relationship between the danger zone and the direct distance of the bullet when shooting. , There will be an outer ballistic similar to or close to a straight line. After this whole period, the projectile began to fall, and then fell sharply.
Generally, when returning to zero in this case, it is the choice that the point where the bullet is not far out of the chamber, and the critical point where the bullet begins to drop significantly, are used as the near and far points. In this way, the bullet in the scope does not fluctuate much. The launch angle does not need to be changed frequently when shooting.
