Worlds longest air rifle shot?

Interesting, speed of sound is around 1125 feet per second, and the sound of the barrel retort arrives two seconds before the bullet strikes the metal. It would have taken the sound of the barrel retort about 3 second to get to the microphone from the shooter (1108 *yards* according to the video), and the bullet arrives two seconds later. This makes the time aloft of the 0.257 round in the ballpark of 5 seconds. Or an "average" velocity of the round about 665 feet per second. With the bullet being launched at a much higher speed. He found a round which had a really good Ballistic Coefficient if his numbers are right, which helped. Great video, thanks for posting.
​For those who want to know the holdover for a 5 second airtime on a bullet.... brace yourself... roughly 400 feet. This is the very definition of a "cloud shoot".