Which type of shell would be classified under High Explosive (HE)?

The classification of shells under High Explosive (HE) is primarily based on their intended function and explosive capability upon detonation. Standard explosive projectiles are specifically designed to produce a high level of explosive force, making them the quintessential representation of High Explosive shells. These projectiles contain a significant amount of explosive material that, when ignited, generates a powerful explosion capable of causing substantial damage to targets.

In contrast, incendiary shells are designed primarily to set things on fire rather than produce a massive explosive effect. Fragile shells typically do not contain substantial explosive material and are not designed for high impact. Depleted uranium shells, while they may have explosive components, are primarily used for penetration and armor-piercing capabilities rather than as a conventional high explosive. Therefore, standard explosive projectiles are the clear choice for classification under High Explosive due to their specific design and purpose.