All ranged weapons alert zombies within a 50-meter radius. Except one: . But you already knew that. Here is the cheat: Equip a Tranquilizer Dart (crafted with Poppies + Empty Syringe). If you shoot a zombie in the foot (not the head), the zombie enters a "stunned" animation loop. It never dies, but it also never moves or screams. You can now walk past entire hordes.
Survival Guide Team Reading Time: 12 Minutes days after zombie survival cheats