What is critical for ensuring the appropriate mortar loading of mortar shells?

The appropriate mortar loading of mortar shells is fundamentally influenced by size. Proper sizing ensures that the mortar shell fits securely within the mortar tube and allows for effective ignition and propulsion of the shell. If the shell is not the correct size, it can lead to incomplete combustion, misfires, or failure to launch properly, which can affect overall mission success and safety.

While other factors like color, weight, and manufacturer may play roles in specific contexts or product quality, they do not have the same direct impact on the fundamental mechanics of how a mortar shell functions within a mortar system as size does. Size directly correlates with the operational parameters necessary for effective use, making it the most critical element.