A fired casing can speak volumes to a gunsmith because of its ______.

A fired casing can speak volumes to a gunsmith because of its ______.

• A. Odor
• B. Striations
• C. Malleability
• D. Color

Answer: (C)

Material property governs what a fired casing can reveal: malleability, the metal’s ability to deform under pressure, shows how the case expands and seals the chamber when a round is fired. Brass casings are chosen for their ductility so they can flow just enough to grip the chamber walls and form a proper seal without tearing. By studying how the casing deforms—its expansion, the shape of the rim, and any thinning or necking—a gunsmith can infer the alloy involved, whether the load was within normal specifications, and if the casing was reloaded or subjected to unusual pressure. Odor and color don’t reliably indicate how the casing behaved under firing, and striations are marks left by the firearm on the case rather than information about the casing’s material properties.

Material property governs what a fired casing can reveal: malleability, the metal’s ability to deform under pressure, shows how the case expands and seals the chamber when a round is fired. Brass casings are chosen for their ductility so they can flow just enough to grip the chamber walls and form a proper seal without tearing. By studying how the casing deforms—its expansion, the shape of the rim, and any thinning or necking—a gunsmith can infer the alloy involved, whether the load was within normal specifications, and if the casing was reloaded or subjected to unusual pressure. Odor and color don’t reliably indicate how the casing behaved under firing, and striations are marks left by the firearm on the case rather than information about the casing’s material properties.