Does this "sound" right to you ?

[GetReal]

I did three different sets of 3- round velocity testing using my Garmin and got a consistent 1,013 ft per second each time on my 9 mm semi subgun.

Shooting it through my Spectre 9 comp was hearing safe but I still got what seemed like echo down the range.... not the Hollywood assassin quiet.

Shooting through my old Trident 9 from SWR was a little quieter but still seem to echo down range.

This sound right to you ?

 

[Clancy]

Indoors? Overhead barriers?

 

[GetReal]

Indoors? Overhead barriers?

Outdoors. 200 yd range. Im the only one with access. Trees both sides, with a partial wall of trees maybe 20 ft thick at about a hundred yards... but an open pass through out to 200

 

[Clancy]

Really shouldn’t hear anything but a little poof and the sound of the bullet hitting the target. Perhaps the air was usually thin and you
heard the sound echoing off the trees?

What’s a semi subgun? Is it gas operated? Could you have a gas leak?

 

[GetReal]

Really shouldn’t hear anything but a little poof and the sound of the bullet hitting the target. Perhaps the air was usually thin and you
heard the sound echoing off the trees?

What’s a semi subgun? Is it gas operated? Could you have a gas leak?

I think the trees were def playing a part.

Semi subgun = semi auto SBR, w/ tri lug mount. Theres really nowhere for gas to leak.

 

[Knotwild]

It may have been your bolt cycling echoing off of something. I’ve never had a perfectly silenced automatic. If it is blowback there’s usually a heavy bolt returning to battery. There’s a big difference between shooting my 22.lr pistol normally and riding my thumb against the slide so it won’t cycle. Even a hearing safe sound can echo.

 

[GetReal]

It may have been your bolt cycling echoing off of something. I’ve never had a perfectly silenced automatic. If it is blowback there’s usually a heavy bolt returning to battery. There’s a big difference between shooting my 22.lr pistol normally and riding my thumb against the slide so it won’t cycle. Even a hearing safe sound can echo.

Yeah... my 22rf are Hollywood quiet.

 

[Knotwild]

Yeah... my 22rf are Hollywood quiet.

What I mean is this: I have several silencers and rimfire pistols. If I ride my thumb on the slide of my semi auto and shoot into a trash can in my garage with subsonic ammunition, and you are in my kitchen, you probably won't hear it. If I let the slide cycle, you will most likely hear something. You might not know what it was, but you will hear something. I once owned an AR 45 and when shooting with a Silencerco Hybrid 46 on it, you could hear the bolt, that weighed 10 oz slap when it ran home after a shot was fired. So, that is what I was saying might be producing your echo. Assuming of course that you are running a blowback gun. Certainly, if roller or radially delayed my theory holds less water. The echo could even be from the bullet hitting the steel.