内容导读：I.IntroductionWiththeprogressofscienceandtechnologyandthedevelopmentofmilitarytheories,thestudyofbull...……
I. Introduction With the progress of science and technology and the development of military theories, the study of bullet trajectory has gradually attracted people's attention. Bullet trajectory is the science that describes the trajectory of a bullet in the air after it is fired, which is of great significance for shooting accuracy, ballistic performance and weapon effectiveness. In this paper, we will compare and analyze the ballistic performance of several different types of bullets, in order to provide reference for research in related fields. II. Overview of Bullet Trajectory Bullet trajectory refers to the trajectory of a bullet in the air after it leaves the barrel. Bullet trajectory is affected by a variety of factors, including bullet shape, launch velocity, air resistance, wind speed, gravity, etc. Different types of bullets have different ballistic characteristics, which in turn affect the effectiveness of the shot. 3. Comparison of the ballistics of different types of bullets 1. Ordinary pistol bullets Ordinary pistol bullets are usually designed with a pointed tip, which has a high muzzle velocity and less air resistance. Its trajectory is relatively straight, making it suitable for shooting at close range. However, as the distance increases, the deflection of the trajectory will gradually increase due to the influence of air resistance and gravity. 2. Rifle bullets The ballistic performance of rifle bullets is significantly superior to that of pistol bullets. Rifle bullets are mostly elongated in design, which has high armor-piercing ability and a long range. When firing at long distances, the trajectory of the rifle bullet remains stable. 3. Machine gun bullets The ballistic performance of a machine gun bullet is between that of a pistol and a rifle. Machine gun bullets usually have a heavier weight and a larger caliber to increase the power of the strike against the target. During firing, the kinetic energy of the machine-gun bullet was large, which effectively penetrated the protective device. Fourth, the analysis of factors affecting the ballistic performance of bullets In addition to the differences between different types of bullets, there are also factors that can affect the ballistic performance of a bullet. First of all, the launch speed is a key factor affecting the muzzle velocity of the bullet, which directly affects the stability and range of the trajectory. Secondly, air resistance has an important effect on the deviation of the trajectory, especially when firing at long distances. In addition, wind speed and gravity can also have an impact on the trajectory of the trajectory. Therefore, in the course of real firing, it is necessary to choose the appropriate firing parameters according to the environmental conditions and target characteristics. V. Conclusions and Recommendations Through the comparative analysis of the ballistic performance of different types of bullets, the following conclusions can be drawn: rifle bullets have a long range and high shooting accuracy; Machine gun bullets have strong armor-piercing capabilities; Pistol bullets are suitable for shooting at close range. In practical application, it is necessary to choose the right type of weapon according to the operational needs and the characteristics of the task. In addition, in order to improve the accuracy of shooting and the effectiveness of weapons, it is also necessary to conduct in-depth research on the factors that affect the ballistic performance of bullets, optimize shooting parameters and environmental conditions. In conclusion, in-depth study of the ballistic performance of bullets is of great significance for improving military combat effectiveness. In future research, new materials and manufacturing processes need to be further explored to improve bullet performance; At the same time, it strengthens interdisciplinary research with other disciplines to promote the development and application of bullet ballistics theory.