What type of round is primarily used to engage anti-personnel targets with the M203?

The primary type of round used to engage anti-personnel targets with the M203 is high-explosive ammunition. High-explosive rounds are designed to create a significant blast effect upon detonation, which is effective in neutralizing enemy personnel. The explosive nature of these rounds allows them to inflict maximum damage within their blast radius, making them ideal for use in situations where engaging multiple personnel targets is necessary.

In contrast, smoke rounds are used for screening, marking targets, or signaling but do not cause injury or destruction, which limits their utility for direct engagement with personnel. Illumination rounds serve to light up an area, enhancing visibility during nighttime operations but are not meant for offensive engagement. Practice rounds are specifically designed for training purposes and do not contain explosives, further disqualifying them from being effective against personnel in a combat scenario.