The same terminal velocity is reached for a typical .30-06 bullet dropping downwards—when it is returning to earth having been fired upwards, or dropped from a tower—according to a 1920 U.S. Army Ordnance study.
The same terminal velocity is achieved for an average .30-06 bullet falling downwards—regardless of whether it is descending after being fired upwards or dropped from a tower—according to a 1920 U.S. Army Ordnance study on its trajectory.