On any trip to the public ranges when I'm there early & there are no other shooters I take some time to hand collect range scrap ( a little bit every week or so really adds up) Since this is stuff that is hand picked off the berms I don't have any rocks or junk in it (& no live rounds as is always warned about). It averages out to be about 75 % jacketed and about 25% cast pistol slugs. I started to sort out the cast slugs since I know most of the folks that shoot there buy commercial cast boolits. This way I sort of know what's in that mass…… but the question I have for the other 75% of jacketed stuff …Is there anything bad, metal wise, I should look for in this stuff? I have some bullets that look to have a blue (plastic) coating on them ( not the usual green of copper being oxidized) & There isn't anybody manufacturing any weird or bad metals that will mess up a smelt of this range scrap is there?