The latest and in this case particularly heart–rending mass killing has re-ignited the gun control debate. Though I own a shotgun and enjoy target shooting and the occasional hunting trip, we have to do something about a situation in which any madman with a gun can load up with thousands of bullets. Yes, guns don’t kill people people kill people, but guns make it WAY easier, and huge magazines full of cheap bullets make it easier still.So, a simple proposition: a tax on bullets. The right to bear arms is enshrined in the Constitution, but gun violence imposes extremely high costs on society. A stiff tax on bullets would make is harder to casually acquire enough bullets to kill 20 six year olds. A box of .223 rounds, the kind used to kill children at Sandy Hook, can be bought online for $9. Let’s quadruple that price.