When should you bore sight the mortar?

Bore sighting the mortar is essential for ensuring that it is accurately aligned with the intended target before firing. This procedure helps to correct any misalignments that might have occurred due to mounting or transportation. The practice of bore sighting after every time the mortar is mounted allows for proper calibration and adjustments to be made, which is critical for maintaining accuracy and effectiveness in both training and operational scenarios.

By bore sighting each time the mortar is set up, gunners can ensure the sight and barrel are correctly aligned, thus minimizing the risk of targeting errors. This process is especially important in maintaining consistency and reliability in the mortar's performance, regardless of whether it is being used in training or combat situations.

Some options focus on specific conditions such as misfires or changing ammunition; however, these are not as comprehensive as the practice of aligning the mortar after every mounting. Only bore sighting during chosen circumstances might lead to inaccuracies if the mortar setup changes or if environmental factors impact alignment. Therefore, regular bore sighting after mounting is a good practice that enhances operational readiness and ensures precision in fire missions.