What must never happen while anyone is forward of the firing line?

The correct answer emphasizes the critical safety protocol in rifle handling. While anyone is forward of the firing line, handling a rifle must never occur because it poses an immediate risk of accidental discharge. The integrity of the firing line is fundamental to safety in shooting sports and training. When individuals are downrange or in a position forward of this line, they are within a danger zone where any unintended action with a firearm can lead to serious consequences.

The other options involve tasks that, while they need to be performed with caution, are considered typical practices when there is no one in a potentially dangerous position. Adjusting targets and opening the rifle action can be managed safely when the appropriate protocols are followed. Sharing rifles, while generally less common in a safety context, would also not inherently pose the same immediate danger as handling a rifle while people are in front of the firing line.

It’s crucial to remember that safety protocols are designed to protect all participants. By strictly adhering to the rule that rifles must not be handled while anyone is forward of the firing line, the risk of accidents is significantly reduced, ensuring a safer environment for all.