Failure defined is failed to penetrate ,failed to hold together.........would have failed to keep me alive facing DG.........ie Failed...not meeting manufacturer's promises regarding bullet integrity or performance ..... Jack O'Conner's misused quote is ambiguous at best. I've killed deer and elk crippled by automobiles with a 1" pen knife........define death...they ended up dead but it took a while to get there....practical yes it killed them but I wouldn't leave my gun at home and hunt with a jack knife. Death is easy.....efficiency is an entirely different matter when your life may depend on how your bullet holds up.......Harold