If you go to his Youtube stuff, you'll see multiple instances of hits at 700+ yards. Lotsa practice. And having the proper equipment makes a ton of difference. Precise hand loads, proper VLD bullets
On the hunting forum, guys talk all the time about the ethics of long range shots on game. On our prairie dog hunts, we get consistent first round hits at 300+ yards with a target grade AR .223. I understand there is a world of difference between that and 1,000 yards, but I suspect few shooters have the equipment and skill to hit something the size of your hand at 300.