The video is great but I'd rather see ballistics tables like this:
I did some more calcs. All are approximates of course, but shouldn't be worse than reality as I'm simply connecting the dots.
Time at 300 yards: ~ 0.4 seconds
Speed at 300 yards: ~ 433 m/s
Speed at 500 yards: ~ 295 m/s
Average speed: ~ 364 m/s
200 y = 182.88 m
182.88 m / 364 m/s = ~ 0.5 s (very roughly)
Added 0.4 TTF to 300 yards, it turns out that if your rifle features small muzzle velocity you should be satisfied with 0.9s time to flight to 500 yards. However if you shoot same round with longer barrel, it will reach target faster.
Remember weapon I refer to has a bit shorter barrel, the muzzle velocity is 883 m/s, not 1000 m/s!