On the other hand, a 26" barreled model will be much quieter and if you shot subsonics it could approach movie levels of quiet. ![]() In real life, the difference is even more pronounced than in the video. You'll have a gout of flame coming out past the can and you overwhelmed the can with the gas supply. In a lot of calibers it’s actually uncomfortable to shoot supersonic ammo without ear protection, whereas a subsonic load with the same powder charge can be barely noisier than the sound of the action cycling. An 18" barrel 308 is going to be LOUD even suppressed. A suppressor helps, but that's why you have the first round pop phenomenon. The reason folks are talking about barrel length is that if you shoot something that doesn't completely burn or barely finished burning by the time it exits the barrel you get a significant flash over when it hits open air. They just reduce the downside of NOT wearing it. Suppressors help, but other than subsonics they are not negating the need for hearing protection. Supersonic ammunition is certainly better for long-range shooting, but nothing beats subsonic ammo and a good suppressor for tasks that require maximum noise. People generally under estimate the need for hearing protection. Anything past about 90 you should wear hearing protection if there will be extended or repeated exposure. Accumulated exposure will cause problems.ġ40 is the threshold for actual pain. One would guess it would be between 116 and 126 decibels, but where would it fall 116 to 126 is a pretty big. ![]() But the 5.7 subsonic has only 55 of the energy that the supersonic has. As you can see from the table below, a 9mm subsonic loses only 15 of the energy of a supersonic round. What I discovered about Subsonic 5.7 and 300BLK was astonishing. I'm curious what sound pressure level I can expect by running the suppressed 9mm with subsonic ammunition. I looked up various loads in 9mm, 5.7, and 300BLK to do some sample calculations. bullet subsonic loads but can also be used with supersonic ammunition when. Mind you, the AMOUNT of damage is vastly reduced for every decibel you drop, and you probably aren't talking significant damage immediately. Basically, it's looking like a suppressed 9mm (supersonic) runs about 126 decibels, while a. We take great pride in our precision button-rifled barrels and the. ![]() The sonic crack at the end of your barrel from shooting super sonics is enough to cause damage.
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