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Supersonic crack with suppressor

 
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  #1  
Old 10-13-2012, 11:42 PM
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Supersonic crack with suppressor

I am new to shooting with a suppressor on my rifles and have maybe a stupid question to ask.
I am using the same suppressor on .223, .308 and .300 Win Mag.
The supersonic crack is created when the bullet exceeds the speed of sound or about 1152 feet/sec. at sea level.
My loads in the .308, for example, chrono at 2640 fps. Question is does the intensity (loudness) of the supersonic crack increase with speed or does it remain about the same. In other words, if a bullet traveling at 1200 fps cracks then does a bullet traveling at 2600 fps(a little over twice the speed of sound) produce a louder crack?
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  #2  
Old 10-14-2012, 04:52 AM
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Re: Supersonic crack with suppressor

no but it takes more powder burning to get those speeds and that will make it louder.
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  #3  
Old 10-14-2012, 12:10 PM
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Re: Supersonic crack with suppressor

I never noticed much of a difference in sound level between firing my 6.5 Grendel at 2300 fps and my 300 WM at 2900 fps through the same suppressor. I guess it would also depend on your suppressor design.
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Old 10-14-2012, 02:47 PM
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Re: Supersonic crack with suppressor

I don't think so at least not at a level that the human ear can detect.
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  #5  
Old 10-14-2012, 06:23 PM
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Re: Supersonic crack with suppressor

A faster bullet would produce a denser wave, which you would perceive as being a more abrupt crack/boom -if it passed you by downrange. Same with a larger or lower BC bullet.
But this is dragged downrange(with the bullet) from the muzzle, and all you would hear of it are reflections off the environment.
What you'll hear shooting the gun is the pressure release, at a rate afforded by the suppressor given the amount of gas you're releasing into it and designed affect on that gas release(capacity).
When the load exceeds suppressor capacity, then the local sound would get louder.
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  #6  
Old 10-14-2012, 08:51 PM
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Re: Supersonic crack with suppressor

Thanks for the responses, I sort of suspected what I have read, but since it was 1966 when I last sat in a college physics class I couldn't quite remember.
I am shooting with the AAC Cyclone and using it on all three of my 700s--.223, .308, and .300 WM with lower velocity loads.
I probably won't mess with sub sonic ammo since it just wouldn't fit into any of my shooting style. I'm afraid it would be more trouble than it would be worth.
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Old 10-15-2012, 05:47 AM
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Re: Supersonic crack with suppressor

physics oh man not looking forward to that class
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