• This Forum is for adults 18 years of age or over. By continuing to use this Forum you are confirming that you are 18 or older. No content shall be viewed by any person under 18 in California.

Shipping container as a Shooting caben built to suppress sound

cw_3302

Hey I am new here. I am looking for some Ideas on a project I'm working on
I got a shipping container that I am building in to a giant suppressor. It a has 4 room the first you shoot from is 12ft the next is 8ft, 4ft, 16. The 8ft and the 4ft insulate. The baffle chamber wall are 4in hard foam and 6in roxul insulation on each side of the 4in foam. The shipping container wall have 2in hard foam and 6in roxul insulation. I have yet to insulate th ceiling. The Decimal reading outside of the box are 60 to 70. Still trying to get down to about 50 zone I am looking for ideas
 
Re: Shooting caben

What size is your exit side as you shoot through. I would think egg crate might arrest the sound better. I just thought of something,what is on the outside of the container. I would spray it with bedliner material to stop the drum effect of the pressure change as you shoot. It actually might amplify what you are trying to achieve with bare steel with nothing to deaden the sounds. How far away are you taking your readings from the container? If you talk to an acoustic engineer he or she could probably tell you what you need to do to deaden it down to almost nothing. The hard foam is a reflector of sound to some degree as it isn't real porous.
 
https://www.google.com/search?q=anechoic+chamber&tbm=isch&tbo=u&source=univ&sa=X&ei=_l6OVJGVCojVoATEioG4Dw&ved=0CEEQsAQ&biw=1120&bih=546
 
60-70dB is already pretty damn quiet. Do you have pictures of this? And instead of bedliner, there is a spray-on sound deadener product that appears to be similar in application, but designed for the purpose of sound deadening. Really the key for metal paneling would be applying something of mass to it to dampen sympathetic vibrations.
 
Had a buddy that tried this because of the neighbors, worked alright he said with his 45-70! So I said what are you going to do when you shoot your bench rifle, the sonic boom is going to pi$$ them off. Later he said you were right. My 2 cents.

Joe Salt
 
CW_3302,
Another area of concern: You have to have a way to vacume the inside floor of your suppressor. Unburned gun powder will collect and build up to a point where one day you will pull the trigger and a flash fire will occure. When that happens, it will be very impressive. This is not conjecture but a fact. Dave
 
"I want to see a video of you screwing that thing on to the muzzle of your rifle."

Now that's funny.
 
Must be an air rifle ;D They have dB readings from 55-95 dB. That's a pretty AMAZING dB reading ::) I say amazing, due to the fact that the M16 with suppressor in place had a reading of 130dB. Without suppressor, 165dB. The 130dB reading gets you below the damaging threshold.

Get a patent on that one quickly ;D You'll become a billionaire in short order ???
 
First, 130 dB SPL is not the threshold of damage, but the threshold of pain. Damage is cumulative and starts way down at lower levels.

Second, gun shots are impulse noise and can easily reach 160 dB SPL. But, when you integrate the level with respect to time, you get the true noise impact.

And, 60 dB SPL is a very soft sound, but your noise level meter may not be reading impulse noise well. I have a sound level app on my smart phone that works real slick, but it totally screws up on impulse noises. It's time constant is so long that the reading is WAY below the actual impulse level. A good comparison is a man's voice at his mouth in normal speaking is 90 dB SPL. This is nearly accurate enough to calibrate sound pressure level meters!

Last, the go-to material to deaden a wall or similar structure is sheet lead!
 
Mass is your friend, coupled with vibration isolators. Years ago, I built a shooting range in my basement. I cast a 4 ft. X3 ft. Round Section of aluminum pipe into the concrete foundation at " shooting height".( standing pistol). From the foundation, I buried 80 ft. Of 6 ft. Corrugated steel culvert pipe out into the yard, with a 3ft vent pipe, at the end. The problem was, my shooting location was right under the kitchen sink. To deaden the sound (after extensive research) I built a room with double thickness drywall inside. Then I built another room inside that, with 2 more layers of drywall (mass) and a 1 in gap between all the walls and ceiling. (Vibration isolation) AND then another room inside that, same procedure.. The mass of the drywall and the gaps, did the job. I could shoot my 44 Magnum, right under my wife, while she was cooking, and she couldn't hear it ( if the TV was on). Outside, at the vent pipe, a bunch of bushes muffled the report to the level of a muffled clap. After 15 years and tens of thousands of rounds, I never had a problem, well, except that all my friends came to shoot my reloads. Of course, we down sized, sold that house, and moved into a smaller property. Thought about a new range, but here we have bedrock too high to make it feasable. I miss that house.
 
You must log in or register to reply here.

Upgrades & Donations

This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.


Click Upgrade Membership Button ABOVE to get Gold or Silver Status.

You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.


To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.

Classified Ads

Forum statistics

Threads
165,786
Messages
2,203,359
Members
79,110
Latest member
miles813

Share This Page

Back
Top