How does temperature affect the performance of machine gun ammunition?

Temperature plays a significant role in the performance of machine gun ammunition, making the first choice the most accurate. Extreme temperatures, whether hot or cold, can lead to several changes in how ammunition behaves.

In high temperatures, the propellant within the cartridge may burn more quickly, which can lead to increased pressure and velocity. This can cause malfunctions or potentially dangerous situations such as overpressure conditions in the chamber. Additionally, very high temperatures can cause the lubricant used in machine guns to become ineffective, leading to increased friction and potential jams.

Conversely, in colder temperatures, the performance of ammunition can be impacted due to the physical behavior of components such as the propellant and primer. Cold weather can result in slower combustion of the propellant, which may lead to decreased velocity and range. Moreover, low temperatures can hinder the functioning of lubricants, increase the likelihood of misfires, and adversely affect feeding and extraction processes.

Thus, understanding how temperature affects ammunition performance is crucial for effective operation and safety during gunnery. Adjustments in handling, storage, and usage may be necessary depending on the environmental conditions faced by Marines in the field.