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SHOOTER DISTANCE CALCULATION BASED ON SOUND:
The speed of sound, give or take based on ambient conditions, is 1,125 fps (feet per second). The speed of a 5.56 rifle round, give or take, is around 2,500 fps from a typical 16" rifle barrel, although it slows immediately after leaving the barrel and gets slower the farther it travels. We could hear from the reports that this was a semi-automatic rifle, not a bolt-action, so the barrel length was likely 16" or 18" at most. If we are recording the event very close to the point of impact, then we will hear the impact of the bullet first, followed by the report of the rifle shot. The time between these two audio events gives us a fairly accurate answer of the distance of the shooter. In the case of the assassination attempt on #Trump, audio analysis reveals 0.22 seconds between the impact and the rifle report (I just checked this myself). Doing the math (algebra), this comes out to about 450 feet of distance for the shooter, at which distance: 1) The bullets would take 0.18 seconds to arrive, and 2) The sound would take 0.4 seconds to arrive. The difference is 0.22 seconds, which is what we find in the audio file. CONCLUSION: Shooter was roughly 450 feet away, give or take, which is about 1.5 football fields away. Hence the difficulty of the shot.
