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Thread: Too hot?

  1. #1
    Paper Hunter
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    Default Too hot?

    Now that I finally have a suppressor for my Glock 17, I'm looking at HD ammo and suspect I may have a problem. For my altitude (6700 ft), speed of sound is about 1090 fps. I have 300 rounds of Federal 147g HST +P that I bought several years ago. It's rated at 1050 fps out of a 4" barrel but I have a 5" barrel so that adds about 50 fps. Hence I think this ammo is just over the sonic crack limit. Alas, I can't test around here (at least at room temp).

    I'll buy some good ammo I'm sure will stay subsonic. But am I correct in thinking the stuff I have now is too hot and defeats the point of a suppressor?

  2. #2
    Possesses Antidote for "Cool" Gman's Avatar
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    The 147g HST non-+P perform quite well. Have you given that some thought?


    Last edited by Gman; 11-29-2019 at 13:26.
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  3. #3
    Woodsmith with "Mod-like" Powers
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    For ultimate quiet, yes supersonic ammo is not ideal. Still gonna be a good deal quieter through the can, though.
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  4. #4
    Machine Gunner whitewalrus's Avatar
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    Should still help a lot to bring the noise down. Subsonic will be the most quiet you can get, so you may want to look at the standard pressure load like Gman mentions. But I wouldn't stress over it if you have plenty of the +P.

  5. #5
    #1 5.556 FAN ray1970's Avatar
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    Quote Originally Posted by Tim K View Post
    For ultimate quiet, yes supersonic ammo is not ideal. Still gonna be a good deal quieter through the can, though.
    Quote Originally Posted by whitewalrus View Post
    Should still help a lot to bring the noise down. Subsonic will be the most quiet you can get, so you may want to look at the standard pressure load like Gman mentions. But I wouldn't stress over it if you have plenty of the +P.
    What they said. Suppressing even high velocity stuff takes a lot of the bark away.

    I have very little experience shooting suppressed but I've mostly shot 5.56 and 7.62x51 and even those rifle calibers at normal velocities were much more enjoyable suppressed.

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  6. #6
    Paper Hunter
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    Cool, thanks guys. I'll pick up some standard pressure and keep the +P in reserve. The hot stuff is probably subsonic at Denver altitude and certainly if I go lower, just not up here. Probably overthinking this but that's what nerds do ;-)

  7. #7
    Paper Hunter
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    Is not speed of sound mostly dependent upon temperature and a tiny bit on humidity?

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    Machine Gunner 00tec's Avatar
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    Quote Originally Posted by Zcsdkr View Post
    Is not speed of sound mostly dependent upon temperature and a tiny bit on humidity?
    Speed of sound depends on density. Barometric pressure (including the lack of pressure at altitude), temp, and humidity can all change the speed of sound.

  9. #9
    Newbie, or Trading Post Troll Jayhawk's Avatar
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    Then Speed of sound is mostly effected by temperature, my E-6B flight computer aka, wiz wheel will prove, also my college aerodynamics class.

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