Assembly Bill 362 would put restrictions on ammunition sellers and require instant background checks of buyers. Unsuccessful at keeping guns from gang members and criminals, California may target a new frontier in its crime-fighting efforts: ammunition.Guns don't kill, bullets do, argues Assemblyman Kevin de León, a Los Angeles Democrat who is pushing the idea."I think it will lead to fewer deaths," he said of regulating handgun ammunition. "But I don't believe it's an end-all or a panacea." The freshman legislator said his bill is particularly timely, given the rampage at Virginia Tech that left 33 people dead.De León has proposed...