Gilding metal is any metal alloy comprised of zinc and 90-95 percent copper.

It is used to manufacture bullet jackets.

aka:

• alloy no. 210 (Copper Development Association ⇒)
• alloy no. 220 (Copper Development Association ⇒)
• commercial bronze

Footnotes / Sources:

“Glossary ⇒.” Sporting Arms and Ammunition Manufacturers’ Institute. Ed. SAAMI’s Technical Committee. Web. 15-18 Jan. 2011.