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"Quiet crowns" - reducing percieved noise and ear damage?

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Unread 09-22-2006, 04:46 PM
Platinum Member
Join Date: Dec 2005
Posts: 2,483
Re: \"Quiet crowns\" - reducing percieved noise and ear damage?

Several folks have used 6 to 12 inch long "bloop tubes" on long range .308 Win. rifles with aperture sights so the front sight can be seen clearer; been happening for many years. Their inside diameter is about 3/4ths of an inch and attach to the barrel's muzzle with a round clamp. Accuracy has not been effected; they shoot very well indeed. And sound levels behind the muzzle are noticably reduced.
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Unread 09-23-2006, 01:45 PM
Silver Member
Join Date: Jun 2003
Posts: 179
Re: \"Quiet crowns\" - reducing percieved noise and ear damage?

Im working on somthing right now. I have a thread started about a week ago over at predatormasterforums. I dont remember origionally were I got the idea but have spoken to a maker of a barrel tuner and also saw that CPC does backbored barrels. A few of the gun smiths I have contacted in the past have never gotten back to me. Right now i have loaded up to test a 22-250 varmint rifle with reduced loads in the 3000-3500 fps range and 33 gr bullets. The rifle is fitted with a pvc unit that clamps on the barrel with hose clamp and uses a extra long pvc pipe coupler that is aprox 3" long. The big problem I am having it my sound meter only goes up to 126db and all my buds are bussy this weekend as i need someont to read and log the data as I shoot, of course after i confirm the unit doesn't blow to pieces. If you check over at my thread in about a week i will probably have some data to have an idea of how much it lowers the sound level. The next barrel I get will have this done to it with a 3-4 cylinder. It should be legal, but I have also emailed BATF but thay have yet to respond also, espically for my clamp on unit. I think there aslo may be an old thread here that i started.
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Unread 09-25-2006, 12:27 AM
Bronze Member
Join Date: Feb 2006
Posts: 66
Re: \"Quiet crowns\" - reducing percieved noise and ear damage?

Over here in the Uk we use sound moderators which really really help,they take away all ther blast you still geg a crack but nothing like what you get without one fitted,You can actually see the strike and hear the hit as a moderator takes nearly all of the flip and recoil out of the gun,at one time we struggled to be allowed to have one but under the health and safety laws to protect your hearing nearly every shooter in the Uk uses one,for an example of there effectivness I fitted one to my 7mm/300 wsm I can have freind stand at the side of me when I shoot it with no ear defenders on thats how good they are,Thet would be perfect for the long range varmint hunter off the bench as you wouldnt need a spotter as you can see the strike
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Unread 11-28-2006, 10:25 AM
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Join Date: Sep 2006
Location: Roanoke, VA
Posts: 69
Re: \"Quiet crowns\" - reducing percieved noise and ear damage?

There is a picture of a rifle with a counter bored muzzle on this website. web page
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