--- a/data/json/items/ammo/20x66mm.json
+++ b/data/json/items/ammo/20x66mm.json
@@ -11,6 +11,7 @@
     "color": "pink",
     "count": 20,
     "stack_size": 20,
+    "loudness": 160,
     "ammo_type": "20x66mm",
     "effects": [ "COOKOFF", "NEVER_MISFIRES" ]
   },