How loud is suppressed subsonic 300 blackout?

kinda sounds like a tack gun

Balrog said:

With no other sound references in the video, I still have no idea how loud that really would be if you were standing there.

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i can hear the guy walking up and breathing as leaves and taking the mag out putting the rifle down on the table as a reference

You didn't hear the insects in the background?

The issue with what you ask is that we have no way of knowing what sounds you would be familiar with.

My best suggestion is to hangout on Youtube for a while listening to multiple videos of guys shooting suppressed weapons, and even then its not the same as in person.

You're asking for a comparison between the rifles' sound and other sounds. I'd say the video does a better job than someone else's subjective description.

Balrog said:

OK. Thanks for the information.

Has anyone heard a suppressed 300 blackout in person?

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Not only heard but have shot one as well.

A buddy of mine built his own on a Form 1.

Maked me giggle everytime I shoot it

Never shot one side by side with air rifle, and it will make a drastic difference how powerful the air rifle is.

Slammed door and gunshot have such different sound signatures that really isnt a good comparison.

Trying to gauge loudness on video is a difficult thing to do. Electronics have a way of compressing the audio and making quieter sounds louder while attenuating the louder sounds. I'm sure there are some videos out there that use a decibel meter to give a more accurate representation of the loudness.

Mine is a bolt action Ruger American. My Gamo pellet gun makes about the same amount of noise.

300 was pretty much developed with short barrels and suppressors in mind, the 223, not so much.

My buddies 300 seems quieter suppressed than the 223 using the same suppressor.

It’s quiet. We can sit here and try to compare subjective noises all day and you still won’t have an idea what it sounds like unless you actually listen to one in person. We run 300 BLK, 6.8 SPC, 458 SOCOM, 5.56, 6.5 Grendel, 22LR, 6.5 Creedmoor, 308, 9mm, and 45 ACP suppressed. 22LR subsonic is the quietest. Period. Subsonic 9mm and 45 are right behind that. Subsonic 300 BLK would be right behind the two pistol rounds. The action cycling on an AR-15 is more noticeable than the round leaving the barrel. You can hear every impact down range. It’s quiet and it is ridiculously quiet compared to a suppressed 5.56.

My son has a 10.5" 300 BO AR pistol, along with an AAC .30 cal. version of the M4-2000 suppressor. The BO is quiet, and as was mentioned, you mostly hear the round thump on impact and the action cycling. I believe its quieter than one of my 9mm Glocks shooting 147 grain subsonics through a wet can, and they sound more or less like a heavy truck door being shut, or something heavy being dropped onto the ground in my carport.

The suppressed 223, and for that matter, the supersonic BO loads, are noticeably louder.

Shooting 223 through his .30 caliber can, is quieter than shooting the same rounds through my M4-2000 that is a 223 specific can though. Im thinking the larger volume of the .30 can takes all the muzzle blast off the round, as opposed to the 95-97% that AAC claims it takes off of mine, and all you hear is the crack of the bullet going downrange.

Not that the 223 specific can doesnt do the job. I can shoot my AR in the carport without hearing protection. I cant shoot a 22LR from the same spot without it, or my ears are dead for a couple of days.

Audio from video cameras, as noted above, is hugely deceptive, from compression of the audio, and limitations of the recieving microphone.
The other issue is whether we are referring to subsonic .300bo or regular elocity. The subsonic stuff is not terribly loud as is (again, as noted above).

From my few (very few) outings around one, suppressed subsonic .300bo is probably about as close to true "hearing safe" as a person can get. As in just barely getting to 140dB, which is the very margin of OSHA "safety" and not actual "does not cause damage" levels. This stuff gets complicated pretty quickly. Like you could probably get, say, .25acp suppressed down to about 70-80dB, but, you'd need to find a use for a 250-350fps .25acp. The Welrod, with unshot wipes, was supposed to be in the 70-80dB range with stock .32acp ammo, but there are a bunch of compromises around wipes, and .32auto.

Balrog said:

How long does it take ATF turn turn around approval on Form 4?

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Bet on a year from the time they cash the check. Might be a little less.

Times seem to be coming down, I'm betting 9 months for my F4 from Dec '18, and 7 for my F4 from May '19. Up until now I haven't waited over 7 months, and my last one came in in Jan '18 after exactly 5 months in jail.

The suppressed .300 BLK I've heard was at the range, so I had muffs on. Quiet but hard to give a comparison. Action noise from something like an AR will add a lot of sound at the ear over a bolt gun.

I can say that my .22 bolt gun with gemtec subs and a SiCo Sparrow on the front sounds like you dry fired it. Much quieter than my .22 Benjamin air rifle. .22 cans are a good starting point because the suppression per dollar ratio is very high, and everyone loves to shoot shoot them. .22's with subs and a can are the only firearms I shoot without single or double ear pro on.

I personally love shooting my tuned .223 AR through my .30 can. It's very pleasant with just plugs in, spits very little gas, and has the ballistics to reach out to fun ranges.

Gtscotty said:

Times seem to be coming down, I'm betting 9 months for my F4 from Dec '18, and 7 for my F4 from May '19. Up until now I haven't waited over 7 months, and my last one came in in Jan '18 after exactly 5 months in jail.

The suppressed .300 BLK I've heard was at the range, so I had muffs on. Quiet but hard to give a comparison. Action noise from something like an AR will add a lot of sound at the ear over a bolt gun.

I can say that my .22 bolt gun with gemtec subs and a SiCo Sparrow on the front sounds like you dry fired it. Much quieter than my .22 Benjamin air rifle. .22 cans are a good starting point because the suppression per dollar ratio is very high, and everyone loves to shoot shoot them. .22's with subs and a can are the only firearms I shoot without single or double ear pro on.

I personally love shooting my tuned .223 AR through my .30 can. It's very pleasant with just plugs in, spits very little gas, and has the ballistics to reach out to fun ranges.

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I sure hope you are correct about the NFA wait time. I sent off Form 4s on a pair of Thunderbeast cans back in March.