He actually had to readjust his scope nearly 3 inches at 100 yards as it held the muzzle down that much.
I agree that the bullet will be downrange but the way he holds the rifle will probably be much more relaxed, and of the flinch factor is reduced. So I therefore can believe there could be a need to change settingsBy the time the muzzle porting may do something somewhat related to its marketing hype, the bullet has left the gun and therefore, no scope adjustment should be necessary.