As society gets more violent and tries to move the blame away people to any tool that can be used to harm others, we are going to see more and more shortages of those tools. Most guns will last a life time, but as we have seen ammo and components will be attacked next. Some at Cast Bollits are working on primers and compounds to reactivate them. Lead bullets would seem obvious, but they are going to be problematic over a certain speed. What would the next step up from lead bullets be? I have heard that some of the cast bollit people are experimenting with Zinc. That is a natural because they sort wheel weights and cull the zinc because they don't want it mixed with their lead alloys. Is Zinc the answer or do we need to look farther? Since I am contemplating a home-built bullet, extreme temps are a no go the only thing i can see is copper or power coated zinc, or aluminum? I am not here to argue about one or the other i just want opinions, as i have no idea what would work best. Or is there something better that I have missed?