[
  {
    "id": "on_hand_473",
    "type": "item_group",
    "//": "a collection of ammo that would be found with a loaded gun.",
    "subtype": "distribution",
    "entries": [
      { "item": "473x33mm", "prob": 100, "charges": [ 1, 40 ] },
      { "item": "473x33mm", "prob": 75, "charges": [ 44, 80 ] },
      { "item": "473x33mm", "prob": 30, "charges": [ 88, 160 ] }
    ]
  }
]