That is up to you. Whatever proof you have, it should be comparable to the shelter in the grassy knoll, with similar temperature and similar wind, wind speed, and the bullets and rifles should be the same.
Documented levels of discomfort thresholds occur in decibels at 120 dB
Documented levels of pain thresholds occur in decibels 130 to 140 dB
Within an enclosure eliminates any factor of wind and or wind speed.
The impact is on the shooter.
.22 caliber rifle 130dB
.223, 55GR. Commercial load 18" barrel 155.5dB
.243 in 22" barrel 155.9dB
.30-30 in 20" barrel 156.0dB.
7mm Magnum in 20" barrel 157.5dB.
.308 in 24" barrel 156.2dB.
.30-06 in 24" barrel 158.5dB. In 18" barrel 163.2dB.
.375 18" barrel with muzzle brake 170 dB.
.410 Bore 28" barrel 150dB. 26" barrel 150.25dB. 18" barrel 156.30dB.
20 Gauge 28" barrel 152.50dB. 22" barrel 154.75dB.
12 Gauge 28" barrel 151.50dB. 26" barrel 156.10dB. 18" barrel 161.50dB.
.25 ACP 155.0 dB.
.32 LONG 152.4 dB.
.32 ACP 153.5 dB.
.380 157.7 dB.
9mm 159.8 dB.
.38 S&W 153.5 dB.
.38 Spl 156.3 dB.
.357 Magnum 164.3 dB.
.41 Magnum 163.2 dB.
.44 Spl 155.9 dB.
.45 ACP 157.0 dB.
.45 COLT 154.7 dB.
Facts on noise levels:
1. Decibels measure sound pressure and are logarithmic. That means that only a 3db increase almost doubles sound pressure, a 6db increase quadruples sound pressure, etc.
2. Gradual hearing loss may occur after prolonged exposure to 90 decibels or above.
3. Exposure to 100 decibels for more than 15 minutes can cause hearing loss.
4. Exposure to 110 decibels for more than a minute can cause permanent hearing loss.
5. At 140 dBA noise causes immediate injury to almost any unprotected ear.
6. There is also the more extreme ?acoustic trauma?, which is an immediate loss of hearing after a sudden, exceptionally loud noise such as an explosion.
Your fakakta video of Bowers in no way addressed the questions I raised regarding the impact on the shooter(s).
So either your shooter(s) had a suppressed firearm , was wearing hearing protection or nobody fired anything from the pergola as per that phony doctored up Moorman photo that you proffered up as evidence showed.
In addition , with 30 years experience in Law Enforcement, I guarantee you if anybody fired an unsuppressed firearm or was not wearing ear protection they would have been on their knees in excruciating pain or rolling around the grassy knoll clutching their ears.