I managed to get copper into my alloy by useing both methods being tossed around on here. I first melted copper wire into some babbit metal I had on hand. I also had some WW contaminated with zinc. I alloyed that batch with copper sulfate from a farm suppy store. $15.00 for 5 pounds. It definatly removed the zinc and the ingots do seem harder. The babbit I;m sure took the most copper so I alloyed 1 pound of it into 10 pounds of the enriched WW. I cast 1500 NOE 22-055 bullets wiqth the melt. I have to get some GC'ed and sized and lubed. I plan to try to get up to around 2500 fps in my .223 Savage 340 with a 1-12 twist. Will let you know how it works out.