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Message
re: SHARE Act / Hearing Protection Act shelved indefinitely
Posted on 10/3/17 at 2:02 pm to jdavid1
Posted on 10/3/17 at 2:02 pm to jdavid1
I will never support it because calling it the Hearing Protection Act is fricking dumb. I wish the snakes would just be honest about what all of their bills due. That goes for both sides of the aisle.
Posted on 10/3/17 at 2:31 pm to Jester
What do you think silencers are for? I'll give you a hint (hearing protection).
Posted on 10/3/17 at 2:31 pm to Jester
quote:
I will never support it because calling it the Hearing Protection Act is fricking dumb.
Then what would you call it? the "Reversal of Over-regulation of a harmless firearm accessory Act" just doesn't roll of the tongue as well.
Posted on 10/3/17 at 2:45 pm to Jester
My post on the OT lounge about rifle acoustics copy and pasted here except for a spelling error correction.
I do [some] acoustic engineering so I'm familiar with the math. Lets do some math.
Google says an AR15 shooting standard ball ammo will measure around 158dBL at 1m. Your hearing is instantly damaged at 140dBL without hearing protection. At 200m away the sound would be 108dBL
A suppressed AR15 is measured around 136dBL for a good quality can. At 200 meters the sound level would be measured at 88dBL. That's a little louder than standing beside a running lawnmower. Can you hear a lawnmower when you are standing beside it? That's how loud an AR15 shot suppressed from 200m away is. But... that is just the measurement of the muzzle blast. Any high powered rifle the bullet is supersonic and is propagating a supersonic shock wave (sonic boom) as is moves down range. That is the "crackling" sound you will hear down range. Again google search finds some testing that shows a bullet's supersonic shock wave will be in the range of 135+ dBA and there is nothing a suppressor will ever do to mask that sound signature. That is a 135dBA noise propagating down the lane of fire you that you should easily be able to hear unless you are deaf. -6dB per doubling of the distance away from the shock wave you are still over 100dBL when you are over 56M away from where the bullet passes by. That shock wave noise level is constant until you hit about 1300fps then it starts dropping off quickly. Plugging numbers into my ballistics calculator, standard XM193 556 ball ammo will not drop down to that velocity level until you hit the 600 yard range.
I do [some] acoustic engineering so I'm familiar with the math. Lets do some math.
Google says an AR15 shooting standard ball ammo will measure around 158dBL at 1m. Your hearing is instantly damaged at 140dBL without hearing protection. At 200m away the sound would be 108dBL
A suppressed AR15 is measured around 136dBL for a good quality can. At 200 meters the sound level would be measured at 88dBL. That's a little louder than standing beside a running lawnmower. Can you hear a lawnmower when you are standing beside it? That's how loud an AR15 shot suppressed from 200m away is. But... that is just the measurement of the muzzle blast. Any high powered rifle the bullet is supersonic and is propagating a supersonic shock wave (sonic boom) as is moves down range. That is the "crackling" sound you will hear down range. Again google search finds some testing that shows a bullet's supersonic shock wave will be in the range of 135+ dBA and there is nothing a suppressor will ever do to mask that sound signature. That is a 135dBA noise propagating down the lane of fire you that you should easily be able to hear unless you are deaf. -6dB per doubling of the distance away from the shock wave you are still over 100dBL when you are over 56M away from where the bullet passes by. That shock wave noise level is constant until you hit about 1300fps then it starts dropping off quickly. Plugging numbers into my ballistics calculator, standard XM193 556 ball ammo will not drop down to that velocity level until you hit the 600 yard range.
Posted on 10/3/17 at 3:54 pm to Jester
quote:
I wish the snakes would just be honest about what all of their bills due
quote:
I will never support it because calling it the Hearing Protection Act is fricking dumb.
Hearing Protection Act makes a lot more sense for this bill than the name for the bill known as the Affordable Care Act
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