How effectively suppressed??

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eastern_hunter
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How effectively suppressed??

Post by eastern_hunter »

Guys,

Some time ago (before the BLK) I build a 300/221 with a 16" SS barrel done by Paladin Machine Services, Is a pistol position 3 way gas gun.

Got started with supersonic load development and ordered a can ... as SAS Arbiter. Some odd happenings like the order getting lost caused significant delays with it. Finally arrived ... Form 4 went to the BATFE 5 weeks ago. Of course in the interim the 300 BLK came out. Had the throat recut to the same length as the BLK ... figuring that a tight chamber wouldn't be a bad thing, and my ammo has proven to work in it. Have not done extensive accuracy testing yet but it does not appear that the longer throat has hurt anything.

Started the acquisition of a 22 LR can in the meantime and the transfer is complete. Is a Bowers Paradigm that uses the SWR Omega baffle structure. Must say is quite effective on a SIG Mosquito.

Was wondering how the subsonic 300 WTF is going to compare to the sound of a good 22 LR pistol.

Anyone have both and care to comment?

Thanks!
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Re: How effectively suppressed??

Post by silencertalk »

I don't know with your can. It is about 127 dB with an AAC can. A 22lr can be significantly quieter. If you want 300 AAC BLACKOUT quieter, then a bolt action will do it.
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Re: How effectively suppressed??

Post by eastern_hunter »

Is supposed to be a 35 db down can.

Subsonic loads in the rifle are pretty soft sounding already. Have no idea what to expect frankly.
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Re: How effectively suppressed??

Post by Dr.Phil »

With the 300BLK, two things add quite a bit of sound compared to a .22lr.
#1: The gas system of an AR (DI is quieter than GP though)
#2: A big ass thirty caliber bullet flying through the air is much louder than a twenty two caliber one.

If you want to have a 300 BLK be as quiet as possible, use a bolt action or a gas system on an AR that has an off position and use 900 fps as your target velocity.
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The closer you get to the speed of sound, the louder it is.
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superman007
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Re: How effectively suppressed??

Post by superman007 »

Does Bullet BC have any noticeable effect on sound levels?
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Re: How effectively suppressed??

Post by Dr.Phil »

superman007 wrote:Does Bullet BC have any noticeable effect on sound levels?
More so bullet shape than actual BC. (Pure aerodynamics in effect here.)
But one does lend itself to the other.
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Re: How effectively suppressed??

Post by doubloon »

So a soft point is louder than a boat tail?
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Re: How effectively suppressed??

Post by Dr.Phil »

It is more about aerodynamics than pure BC.
Since the sonic boom doesn't exist with a sub-sonic load, the flight noise of the bullet becomes audible.
For instance,
- A flat based bullet will sound different than a boat tailed bullet.
- A ballistic tipped bullet will sound different than a round nose.

It just so happens that boat tailed bullets usually have higher BCs than flat based bullets and the same goes for RN vs. BT.
BC takes weight, length and sectional density into account along with the aerodynamic drag coefficient.

Think about a golf club vs. a baseball bat.
Both are going through the air at similar speeds, but they sound very different as they travel through the air.
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Re: How effectively suppressed??

Post by doubloon »

I couldn't tell, was that a yes or a no?

But since you keep saying it's more about aerodynamics than BC I'll add a second question to the one yet to be answered.

You're saying a 50 cal. A-Max style 750gr bullet would make the same amount of noise moving through the air at the same subsonic velocity as an aerodynamically equivalent 22 cal. A-Max style 75gr bullet?
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superman007
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Re: How effectively suppressed??

Post by superman007 »

I would consider it a air disruption deal, the smaller and tighter pocket the bullet can make when traveling the less disruption and noise. So a Higher BC bullet would probably also in most cases be a less disruptive bullet across the flight path.

Probably not enough to factor over terminal ballistics though. Would be a fun thing to test.

A 50 cal is going to rip up more air than a 22 so I would think unless the 22 is made like a whistle it is no contest.
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Re: How effectively suppressed??

Post by Dr.Phil »

doubloon wrote:I couldn't tell, was that a yes or a no?

But since you keep saying it's more about aerodynamics than BC I'll add a second question to the one yet to be answered.

You're saying a 50 cal. A-Max style 750gr bullet would make the same amount of noise moving through the air at the same subsonic velocity as an aerodynamically equivalent 22 cal. A-Max style 75gr bullet?
I couldn't answer your initial question with a yes or no.
A boat tail of a bullet is a completely different influence from a soft point.
There are both flat base and boat tail soft point bullets.
The boat tail version will be more aerodynamic and would in theory be more quiet.

It is also about air displacement.
A larger projectile displaces a larger volume of air.
Just like a larger speaker does.
The same principles apply.
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Re: How effectively suppressed??

Post by doubloon »

So since displacement and aerodynamics are two fundamental components of BC you make it sound like BC has a lot to do with how much noise a projectile makes at subsonic speeds.
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Re: How effectively suppressed??

Post by silencertalk »

I don't think anyone thinks it is worth optimizing the shape of the bullet for minimum flight noise. The shape matters too much for other things.
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Re: How effectively suppressed??

Post by Dr.Phil »

doubloon wrote:So since displacement and aerodynamics are two fundamental components of BC you make it sound like BC has a lot to do with how much noise a projectile makes at subsonic speeds.
Sorry if there was confusion there.
Lower BC bullets typically also have good aerodynamics as well.
BC has nothing to do with flight noise, but the two main contributors to fight noise do have alot to do with BC.

Example:
Take two 30 caliber bulllets that have the same phisical dimensions of a Sierra Match King.
Once is jacket Pb, the other is jacket Al.
The lead bullet will have a much higher BC than the Al bullet, but the flight noise will be similar at a given velocity.
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Re: How effectively suppressed??

Post by imyomama »

eastern_hunter wrote:Guys,

Some time ago (before the BLK) I build a 300/221 with a 16" SS barrel done by Paladin Machine Services, Is a pistol position 3 way gas gun.

Got started with supersonic load development and ordered a can ... as SAS Arbiter. Some odd happenings like the order getting lost caused significant delays with it. Finally arrived ... Form 4 went to the BATFE 5 weeks ago. Of course in the interim the 300 BLK came out. Had the throat recut to the same length as the BLK ... figuring that a tight chamber wouldn't be a bad thing, and my ammo has proven to work in it. Have not done extensive accuracy testing yet but it does not appear that the longer throat has hurt anything.

Started the acquisition of a 22 LR can in the meantime and the transfer is complete. Is a Bowers Paradigm that uses the SWR Omega baffle structure. Must say is quite effective on a SIG Mosquito.

Was wondering how the subsonic 300 WTF is going to compare to the sound of a good 22 LR pistol.

Anyone have both and care to comment?


Thanks!

here you go.. 9" upper with arbiter.. supersonic and sub ... never shot it next to a 22 pistol... but it's quiet!
http://www.youtube.com/watch?v=2UehOw94yc0
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"Are you gonna pull those pistols or whistle Dixie?" --- Clint Eastwood --- The Outlaw Josey Wales
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