So, due to reasons magical, civilization has aversion towards metals which are above antimony in reactivity series. Yet, that doesn't stop them from developing gunpowder and wooden cannons. But while wooden cannons made of hardened wood with a copper tube inside is cool, one wishes for more than just that, even if these special cannons would be rare.
So my question is, among the metals and alloys consisting solely of these metals, is there any that would compare to bronze in terms of both simplicity of making guns of(that is, it doesn't have too high a melting point), and does have qualities of cannon metal comparable to the gun bronze? Rarity of the material is not an issue, only the simplicity of working with and quality of the final product.