Gunmetal is a type of bronze which was originally used to make guns before it was superseded by steel. It is the type of bronze that foundry's make our castings
out of. There are two types of Gunmetal: Admiralty and Leaded GM, the Admiralty stuff having a better tensile strength and is more expensive. The Leaded GM replaces 2% of the zinc with lead making it easier to cast
We also talk about Phosphor Bronze but when we do we refer to three different materials: Drawn Rod, Hard Drawn Wire and Cast P.B which is used for bearings. Often evil stuff to machine
Jo