In which situation is it permissible to leave inert ammo without drilling holes?

Leaving inert ammunition without drilling holes is permissible when enhancing display integrity in museums. The primary purpose in these settings is to visually represent historical or educational aspects of ammunition and weaponry without compromising safety or changing the condition of the objects. Drilling holes in inert rounds could potentially damage or detract from their aesthetic and historical value.

Inert ammunition has significant value in display contexts, where it is crucial to maintain its integrity, appearance, and historical accuracy. Other settings, like active training or live fire simulations, prioritize functionality and safety; therefore, inert ammunition would typically require modifications to ensure safe handling and realistic training scenarios.