Loudness factor- barrel length vs porting?

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crunch68

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I've always been told and believed that porting a barrel makes it louder, especially to your companions. I was wondering how barrel length fits into this equation, or does it even?
For example, would a a 26" or 24" non-ported barrel be as loud as a 28" ported barrel?

Thanks
 
Shorter barrels in general will be louder, as they will have higher pressure at the time of gas egress. The ports will generally be closer to you too. The type of porting will be the biggest factor. The type that angle the gas rearwards will be the loudest.
 
pv=nrt is the (General Gas) equation. Less length, less volume, more pressure, more noise. The port reduces the effective length of the barrel.
And your location will affect the perceived sound level.
 
Is there anyway to compare porting relative to the barrel length? Sort of like, the location of the porting equals the relative length of the non-ported barrel in terms of loudness?
 
I usually notice a loud report while I am gabbing with some one and look over at the skeet field and see a fellow shooting a 24" barrel. When I am shooting beside someone on the trap field with a ported barrel, I don't usually notice a loud report.

The noise does not bother me, that is why I wear hearing protection. This is just what I have noticed.
 
I have a vintage 870 wingmaster TC trap or something like that with all of the 70's mods of the day like special adjustable stock, lengthened forcing cones, etc including fully ported 30" barrel.
It is definately much louder that when I put a standard 30" barrel on the gun how much I cannot say since I never had a meter to measure it.
What I have heard from the boys time and time again when I shoot it that it gives a very sharp crack vs a boom which they find makes it seem even louder and harder on their old ears.
 
Anyone shooting any gun while not wearing hearing protection is damaging their hearing, permanently, one shot at a time. From personal experience, I'd say most shooters do not realize this until it is much too late. Wear hearing protection! ( and avoid short & ported barrels)
 
crunch68 said:
Is there anyway to compare porting relative to the barrel length? Sort of like, the location of the porting equals the relative length of the non-ported barrel in terms of loudness?
Click to expand...

Covey Ridge said:
To determine this for sure you may need a noise meter.
Click to expand...

crunch68,

Covey's suggestion would be the way to go. You would really have to experiment by trial and error. There are many factors determining how loud a shot will sound. Type of load, barrel length, type of porting, location of porting, etc...
 
I figured that there would be a lot of variables. I just wondered if there was some kind of ballpark rule. For example, a 28" ported barrel is approximately as loud as a 24" non-ported barrel.
That sharper crack with the porting is not nice.

Thanks everyone.
 
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