Thread: Short barrels and decebels

Originally Posted by veitnamcam

I am pretty much convinced now if it has to have a can it will be as short as possible/legal.

Yea, now we are talking. I have a bit of a thing for short guns with cans even more so if they make fu#k all noise shout out if you want to have a play with one

Originally Posted by screamO

Yea, now we are talking. I have a bit of a thing for short guns with cans even more so if they make fu#k all noise shout out if you want to have a play with one

Have had a play with a few, maybe even yours

We ll be calling you Vietnam can soon ;-)

Originally Posted by gimp

dB scale is logarithmic, 3dB = "twice as loud" from memory

....

For factual accuracy, a 3dB increase is twice the intensity, a 6dB increase is twice the sound pressure level and (down in more sane noise ranges) 10dB is twice the "loudness". 140 dBSPL peak is considered max safe level for impulse sound. You are completely wasting your time/fooling yourself if you try to use cheaper meters on impulses- they will grossly under-estimate the peak level

6x47 (Audiologist)

Originally Posted by Friwi

We ll be calling you Vietnam can soon ;-)

Just need a rifle and scope and can

Like a 14" gun with a can will be the same length as an 18" tubed gun without one and will still be fine for "normal hunting ranges"


Short short barrels don't suppress as well though obviously

Originally Posted by 6x47

For factual accuracy, a 3dB increase is twice the intensity, a 6dB increase is twice the sound pressure level and (down in more sane noise ranges) 10dB is twice the "loudness". 140 dBSPL peak is considered max safe level for impulse sound. You are completely wasting your time/fooling yourself if you try to use cheaper meters on impulses- they will grossly under-estimate the peak level

6x47 (Audiologist)

Thanks.

Anyone got a 75 or 85 action lying around gathering dust?

I wish.

Originally Posted by veitnamcam

Anyone got a 75 or 85 action lying around gathering dust?

75 long and short with misc 6.5 barrels attached, also stocks etc, chuck that tomato stake

Originally Posted by gimp

75 long and short with misc 6.5 barrels attached, also stocks etc, chuck that tomato stake

What sort of dollars would you be looking to get for one?

A 10 inch barrel wont hold up much of a tomato plant so looks like I am stuck with using it to kill stuff.

They're sort of compete + good rifles so probably would want more than you're looking to spend for a donor action

Originally Posted by veitnamcam

Of course, but a can does not automatically make it hearing safe either, in fact it probably wont unless you run subs exclusively.

Anyway, is there a point where db increases dramaticly? like velocity loss, bugger all for the first couple of inches and more for each inch after that?

Or put more simply,how short could I go on a 308 without "Having" to use a can just to be able to use it.

1. You will always need earmuffs without a suppressor to not cause hearing damage with a 308.
2. Couldn't give you a length but i'd guess that with really good earmuffs you could go pretty bloody short.

I consider my 308 hearing safe with it's suppressor - but it does depend on the environment. For example I fired one shot at the range without earmuffs once (after shooting it in the field and seeing it was fine) - and holy fuck it was bad. Because you're surrounded by hard surfaces and the sound just crashes straight back into you after bouncing off everything. In thick bush it may be nearly the same if you're surrounded by a lot of trees.

Shooting it out on an open field I don't consider it to be causing any damage at all from everything I read, and I was quite paranoid about it. I probably should get a meter and measure it at some point to be sure.

I guess my logic is if i'm shooting it a lot (targets or rabbits) I wear my earmuffs. If i'm hunting and "might" fire 1 shot at a deer, then I don't. But if I didn't have a suppressor I would.

Edit - and you can get over-barrel suppressors that only go 8 or 10cm forward of the muzzle. So you can chop 3-4 inches, put one of them on and the rifle will be the same length but FAR quieter. So there really is no reason not to use a suppressor on something like a 308.

Originally Posted by veitnamcam

I am pretty much convinced now if it has to have a can it will be as short as possible/legal.

That is the reason I went with a bush pig 300 Blackout, silent and short. The down side is no more long range shots but that's no biggy.

Originally Posted by tikka

That is the reason I went with a bush pig 300 Blackout, silent and short. The down side is no more long range shots but that's no biggy.

Yea tho looking at some 15 inch pistol data for 308 win 130sp at 2800 150 @ 2500 it will probably still be fairly usefull with a 130 hp or 155 amax etc out to 300 odd even at 10 inch barrel?