There is 85-5-5-5 bronze which is as said 85% Cu [copper], then 5% Pb [lead], then 5% Zn, then 5% Sn [tin]
It should be a good alloy . The Smith Cooper appears to use what I call 85-5-5-5 bronze.
Lead, copper and tin are highly resistant. THere is so little zinc it has no great effect.
Other wise I would go by the mfgr. Groco , Buck ALgonquin, Spartan Marine to use good alloys.
You could also ask the mfgrs. above about the alloys.