You don't want to enhance that as the shooter where your ears are at. This is where the wipe doesn't help as your going to get some port pop from the action. Even on a semi auto a traditional baffle can should sound a bit better compared to the OSS. Completely night and day difference compared to the semi auto you heard with that OSS can. On a bolt gun with the wipe 300 blks subs are holly wood quiet. Accuracy will suffer some but at subsonic velocities the effective working range your most likely engaging at will be much shorter and its not that big of a deal. You can even reduce that muzzle report further with the addition of a wiped endcap.
#300 BLACKOUT SUBSONIC AMMO DB LEVEL MANUAL#
When your looking at a subsonic application a traditional baffle stack that focuses on the muzzle being as quiet as possible with a manual action is the way to roll. Probably not the best representation for you to observe suppressed 300blk subsonic shooting from. The idea is to mitigate backpressure and reduce some of the port pop your getting from a semi auto action. They really shine on high velocity super sonic calibers and are louder at the muzzle intentionally.
#300 BLACKOUT SUBSONIC AMMO DB LEVEL MOD#
When it came out around 2008 timeframe- it was considered a very good performer for its size which is similar to a recce 7 mod 4. What this calculator does is tell you the best range to zero at so that you will hit a target of a given size with no holds. It averaged about 127.5db muzzle, 134 ear. Youll need to know your bore height (measure center of bore to center of optic) ballistic coefficient which depends on your bullet (Google it), and your velocity (if you dont have a Chrono use 1050 for subs). The original 300blk can was the aac 762sdn6, and it sort of set the original standard for 300blk performance. The Oss HX QD in our test averaged ~143 muzzle and 140 ear for an example of one of the loudest options for subsonic 300BLK. The lower third of market cans Ive tested are probably more like 133 muzzle and 138.5 ear (or worse) in subsonic to give you an expectation of range across market options that are average in size for the class. Most decent 30cal cans hover around 126 muzzle and 133 ear on the same platform with subsonic ammunition. That is very quiet, the lowest muzzle and ear noise Ive tested on a gas operated ar15 in any caliber. Our most quiet can that we have tested in our collection of all manufacturer items we have, is the Recce 7 mod4 and that was ~121db muzzle and 127.5 ear average in 5 rounds with our std mk1 9.5” 300blk. We 'expect' a gunshot to be loud, and when a silencer is attached, the reduction in SPL leads us to believe that the sound is 'quieter' than it is.It will vary by each model of suppressor. Keep in mind that perception affects us as well. Silencers, when used on small caliber weapons can reduce sound pressure levels enough to be considered 'hearing safe' but should only be tolerated for a short time. Your hearing can be damaged by 8 hours of exposure to 90dB, but can tolerate 120dB for short periods. That's why a 150dB impulsive sound like a gunshot can be immediately damaging and immediately painful, and one that measures 30dB less can be more easily tolerated. So when a silencer reduces the measured sound level by 30dB, it's reducing the sound pressure (amplitude) by a factor of 1,000. And a sound that is 100,000 times as intense is 50dB above the threshold. A sound that is 100 times more intense is 20dB above the threshold. higher amplitude) is 10dB above that threshold. A sound that is 10 times more intense (i.e. The dB scale by which all sound is measured is logarithmic, and is referenced to the lower threshold of human hearing. 1 2 Next Mnags New Member Posts: 3 Joined: Tue 7:26 pm Lowest db at shooters ear with suppressor by Mnags Wed 9:36 pm I'm looking to build a rifle in 300 blackout with a dedicated suppressor and running only subsonic as I hear this is probably the quietest AR setup. SPL (Sound Pressure Level) is what concerns us here.
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