Awesome cross by Craig Fraser!!
A few comments on gunshot sounds... (this is based on a lot of personal shooting experience)
There are 3 primary components to a gunshot sound.
(1) The detonation of the powder in the cartridge
(2) The report from the barrel as the bullet exits
(3) The sonic wave produced from the bullet travelling through air.
Of the sounds, (1) is not very significant, similiar to a cap gun (2) is significant decibel level, but of very short duration - mostly a "pop" (3) is significant decibel level and the longest duration sound -
Sound (3) is the sound that "carries" the furthest.Why? The distance from the muzzle to the target has a significant bearing on the overall decibel level. When a bullet travels faster than the speed of sound, a sonic wave is produced.
This sound (3), from the sonic wave, is the sound that draws attention from a distance. This is the "ptttttcheeew" sound that most people hear from a firing range. Combine (2) and (3) and you have a classic typical gunshot sound.
A silencer only mitigates (1) and (2). For this reason, a silencer is primarily effective only when shooting short distance to targets.
I have shot center fire handguns at close range targets, and if the target is less than 1 foot, the sound is not particularly bothersome beyond a short distance. And a handgun isn't that loud while being within a confined space such as a garage.
For example, were I to shoot a .38 handgun in my country yard at a 1 foot distance, I doubt my closest neighbors ~300 yds away, inside their homes would pay much attention. If they were in their yard, they would hear it clearly. I would not expect anyone more than 500yds away to even know it was a gunshot. But, were I to instead shoot at a 300 yd target, people would hear the sound from easily 2 miles away.
My second point - the first shot, even if high decibel level at a target, is very difficult to pinpoint location of sound source. Only a 2nd or 3rd shot allows the human brain to diagnose direction.
How this applies to the TB murder trial - a handgun fired 8-12" away from a target, in a confined truck cab, would not be as loud as many might think, inside the cab even. If the windows were up, it would not be significant to anyone more than 100 yds away.
I don't see a handgun fired near Book and Trinity road, within the confines of a truck cab, drawing much attention from neighbours. My opinion only...