What is the role of the bullet in a cartridge?

The role of the bullet in a cartridge is primarily to be propelled towards the target. When the gun is fired, the gunpowder ignites, generating gas that builds up pressure behind the bullet, forcing it out of the cartridge and down the barrel of the firearm. The bullet is designed to be aerodynamic and engage with the rifling of the barrel to achieve accuracy and distance as it travels toward the target. This propulsion and trajectory are critical to the effectiveness of a firearm in hitting a target.

Other components of the cartridge, such as the primer and gunpowder, serve different functions. The primer ignites the gunpowder, and the weight of the cartridge is not significant to its main function, which is the movement of the bullet. The bullet itself is what ultimately strikes the target, making propulsion its most vital role.