A 140 grain bullet at 2800 takes .36 seconds from the time it leaves the muzzle till it impacts a 300 yard target.
Sounds about right. The 7mm 140g North Fork I used on the buck was going a mite faster, a nominal 3214fps at the muzzle and would have arrived the 150 yards downrange to the buck in about .148 seconds. Moving at 10mph the buck would have gone over 2 feet in that time. Even from a standing start he was able to turn an 'easy' quartering-away/behind the ribs shot into a ham shot and only had to move about a foot to do so. It was a once-in-31-years Murphy event.
The photo below shows one reason I like North Fork bullets - reliable but controlled and limited expansion over a wide range of velocities. The first was recovered at the range, the second from the far side of an elk after breaking a leg and ribs, the third from the aforementioned buck after penetrating from ham to sternum.