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The noise problem!

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Zed View Drop Down
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    Posted: October 04 2018 at 4:01am
Ok Gent's, I have serious a question to ask,; that may help our club keep the large bore rifle range.

What are the best types of installation for reducing the emitted noise when shooting large calibre rifles such as .303 or .308 etc? We also need to make sure that we cannot shoot the sky.
We are talking about suppressing the firing line noise, not suppressing the actual rifle.

Obviously cost is also an issue. But if we know what works best; we won't have to waste money trying stuff that doesn't work.

I suggested using large diameter concrete drainage pipes over maybe 5 metres, this would help the safety issue, but may just redirect the sound. So then thought about using a number of heavy rubber baffles inside the concrete pipe to interupt the sound waves; like the baffles in a silencer.
However before setting out on this experiment, I thought maybe someone here has already attended to this kind of problem and found a solution.

For info, the firing line is in a covered area with block walls to side and rear and asbestos roof. No insulation at present.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 6:42am
A lot of ranges here use that corrugated plastic culvert liner  pipe.
They cut 4' lengths, line it with spray foam & bolt it to the bench top, you lay in & shoot through them.

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 6:43am
I hate them but you gots ta do what ya gots ta do!

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 6:43am
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 11:04am
That has given me an idea Shamu, thanks! As we need the security as well as the sound reduction; these plastic corrugated pipe suspended inside a larger concrete pipe, then fill with expanding foam between the two. That might be a good solution.

How would you rate the effect on noise of the plastic pipe?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 1:07pm
It drops volume considerably, but it also alters the firing signature to more of a "Poink" than a "BANG".

Ours have the foam on the INSIDE, I'm not sure what it would do on the outside? The corrugations would act a bit like baffles bouncing the sound back to the shooter.

A different range we use has gravel inside a double will structure, maybe build an open topped box from 2X4 Framing & ply, then dump some gravel in, add the pipe, overfill with more gravel & add the top? a 4" or so thickness will stop a .44 magnum, because any impact will be at a shallow angle. These pipes are designed to be buried.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hoadie Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 3:16pm
An old colleague of mine has a "drum room". He's a session drummer, so he plays alot & loud. He lives in a semi..but his nieghbours don't seem to hear him..& / or complain at all.
I gotta track him down & find out what he did for that.
(Man, I gotta track alot of folks down, all of a sudden - thanx to this forum)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 3:32pm
Find someone how owns the property a mile directly opposite the range. Buy a huge stadium quality sound system. Play AC/DC 24/7 for a week, full blast. They'll be begging to hear rifle fire after that!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 4:27pm
How do you shoot prone, sitting or standing with this set up? Our soldiers who carried this rifle did not have such convenient benches to rest the rifle on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: October 04 2018 at 5:47pm
we have uninsulated tubes on our 200 yard range , they are loud , i see the appeal of these and the drawbacks , thanks for showing these options , i will pass them to the range manager here , i think it worth considering 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stanforth Quote  Post ReplyReply Direct Link To This Post Posted: October 05 2018 at 1:52am
Originally posted by britrifles britrifles wrote:

How do you shoot prone, sitting or standing with this set up? Our soldiers who carried this rifle did not have such convenient benches to rest the rifle on.
 
Yes they did... They were called trenches and firing steps..LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: October 05 2018 at 4:29am
All our large bore service rifle competitions are shot from prone position; but not everyone shoot's service rifle, So I suppose we need to make it bench height, with a table adapter to lie on when shooting prone
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 05 2018 at 8:17am
Originally posted by britrifles britrifles wrote:

How do you shoot prone, sitting or standing with this set up? Our soldiers who carried this rifle did not have such convenient benches to rest the rifle on.

Unfortunately you can't. But the range mandates shooting from the bench ONLY anyway!

This is not an uncommon restriction either. Its a desperate attempt to stop "flinging one over the bank" by the less talented shooters. Sadly an event far more common than they'd like to have you believe. That range shown had such an incident which was what prompted the damn things in the first place! Look at the image looking through the tube, see the bullet strikes all over the inside! (particularly at the 7~8 o'clock position).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: October 05 2018 at 9:11am
At my range at both the 100 and 200 yd positions, about 25 yds out are humungous railway timbers supported by wood telephone poles that run continuously in front of all shooting tables. Unless you shot over them, (they are about 7' off the ground and maybe 15' high) you can't breach the been at the target end. Our pistol and shotgun ranges have a similar set up, albeit only 50 yds long.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pukka Bundook Quote  Post ReplyReply Direct Link To This Post Posted: October 05 2018 at 6:58pm
Gents, it makes me appreciate shooting on our own range here on the farm..
 
It must be hard to get used to such set-ups.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote englishman_ca Quote  Post ReplyReply Direct Link To This Post Posted: October 06 2018 at 6:46am
Gotta love Ontario. I live out in the country side. Only one neighbour within easy walking distance, but many more within ear shot.  I put a goodly sized dirt backstop behind and off to the side of my garage. Thick bush behind on a steep hill and nobody living back there beyond.

I can shoot from a bench built inside on a garage window sill for when it is raining (often snowing). My outdoor firing point is set up at fifty yards. I max out at 100 yards.

There are a few 'gun enthusiasts' in the neighbourhood. It is like howling to a wolf pack and getting a response. All quiet until I hear distant gunshots from one direction, listening to the shot string by somebody plinking. I then hear gunshots from another direction. So I join in with whatever I have with me that day and take a few shots too.

Jungle telegraph. It is almost hunting season.

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