const shots = [
  {id: 1, amount: 2},
  {id: 2, amount: 4},
  {id: 3, amount: 52},
  {id: 4, amount: 36},
  {id: 5, amount: 13},
  {id: 6, amount: 33}
];

shots.reduce((acc, shot) => acc = acc > shot.amount ? acc : shot.amount, 0);