I agree Jerry is Da Man and I doubt there is another person at his level but the physics of this say otherwise. At 1,000 yards the Hornady 147 grain factory ammo has a drop of 263.7 feet when the data is placed into their ballistic calculator.
In the video Jerry is holding the gun parallel to the ground. To correct for the drop you need 269 MOA and its not there. Plus any round fired would have to travel a parabolic course which means the bullet will glance off the target and any bullet splash will continue on the same downward course and not do a near 180 to hit the balloon above and to the right of the tangential impact point. I do not believe he made the shot.
Just my opinion.
I just plugged the 147 gr Hornady XTP on the JBM ballistics calculator, muzzle velocity 1040 fps.
If the sight height is 1.4" (about right for a red dot mounted as shown), and the revolver is zeroed at 50 yds, the drop relative to line of sight at 1000 yds is about 222.1 feet = 74 yds. He mentions he is holding about 75-80 yds high, so everything is in the ballpark. This means you have to aim 7.4 yds high at 100 yds, a mere 7.4% slope.
He can make the shot because he aims at an imaginary point obove the target, and someone (with VERY good optics) is probably calling where the bullets impact. With the red dot sight he can aim high and still see the target, the difficult part is "burning" the sight picture into your brain one the dope has been found, since there are no reference points in the background. Once the dope is found, it is a matter of firing enough rounds until one hits the target in the "beaten zone". Easier said than done, since the average group size at this distance most probably is in the order of 6+ feet (from a mechanical rest), larger than the metal targets, and a slight, impossible to detect, lateral wind of just 1.0 mph would move the POI about 17.3" to one side. The apex of the trajectory is about 77.8 feet above the ground, and normally wind blows harder above the ground level.
The metal targets look about 24"x48", and this size is barely visible at this distance, but still good enough to give it a try
AMAZING SHOT!