Years ago, I watched FReeper Glades Guru and a friend cut a high tree branch (2” in diameter) with an AK-47. They called it “ballistic tree trimming”. It took an incredible amount of rounds - all direct hits - before it severed.
My concern for falling rounds (they were shooting nearly straight up) were poo-pooed: “Nobody’s in the ‘Glades on a weekday”. (-:
It works much better after an ice storm, when the branches are loaded down with the weight of the frozen water. A single well place round will do it :)