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❓ WHY did my PP700 get louder?

Forums PCP Airguns PCP Airgun – Tuning & Repair ❓ WHY did my PP700 get louder?

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    JungleShooter
    Participant
    Member
    Peru
    Accuracy: +70

    ❓ WHY did my PP700 get louder?

     

    I have been shooting my PP700 regularly.

    However, lately, both I and others thought that it sounded louder than it used to.

    ❓ I wonder what might have happened — because I need it QUIET! 😊

     

     

    🔶 The specs:

    PP700S-A

    .22 cal 

    Pellet:  H&N Sniper Light 14.04gr

    Sumo silencer

    Huma regulator

    Tune:

    REG 120bar

    MV 688fps (14.8FPE) = 4.5% below the knee of 720fps

     

     

    🔶 All I did recently to the gun was I extended the dovetail rail with a dremel to have more space for a long dovetail-to-picatinny rail adaptor.

    And I changed to higher rings to mount a Tactacam on the Discovery VT-3  3-12×44 FFP.

    After rezeroing it, it keeps hitting the pigeons at long ranges, just like before. 😊

     

     

    Puzzled…. 

     

    Matthias

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    uhfradarwill
    Participant
    Member
    United States
    Accuracy: +5

    If someone used a "dremel" on you, I bet you would be louder as well.

    Good luck!

    Will

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    elh0102
    Participant
    Member
    United States
    Accuracy: +54

    Have you checked the breech seal? If it's even partially blown, it will make noise. And a chrono would probably show a loss of velocity, although accuracy might remain acceptable. 

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    JungleShooter
    Participant
    Member
    Peru
    Accuracy: +70

    elh0102,

    yes, for short ranges a loss of velocity would be OK, but I'm hitting stuff out to 60 yards, I'd assume that at those ranges a loss of velocity would make a big difference….

    I checked the breach seal, seems OK, but I'll inspect if a little closer in the morning.

     

    Thanks,  😊

    Matthias

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    JungleShooter
    Participant
    Member
    Peru
    Accuracy: +70

    [double post]

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    Vetmx
    Participant
    Member
    United States
    Accuracy: +81

    Yeah, when that breach seal starts to go the gun literally makes a pop sound.

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    darkskyy
    Participant
    Member
    United States
    Accuracy: +2

    How much velocity do you usually loose when the seal starts to go?

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    elh0102
    Participant
    Member
    United States
    Accuracy: +54

    darkskyy

    How much velocity do you usually loose when the seal starts to go?

    I think it varies a great deal. The seal  could dislodge a small portion, or the entire O ring could blow out. The only time I actually measured it, was when a small section of the O ring blew out, and I think the velocity loss was around 100 fps.

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    darkskyy
    Participant
    Member
    United States
    Accuracy: +2

    elh0102

    darkskyy

    How much velocity do you usually loose when the seal starts to go?

    I think it varies a great deal. The seal  could dislodge a small portion, or the entire O ring could blow out. The only time I actually measured it, was when a small section of the O ring blew out, and I think the velocity loss was around 100 fps.

    Thank you, I am having a drop of about 30 fps in my Uragan but with a loss of accuracy. 

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    KatoKevin454
    Participant
    Member
    United States
    Accuracy: +10

    Breech or Barrel seals

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    JungleShooter
    Participant
    Member
    Peru
    Accuracy: +70

    THANK YOU ALL for your advice, YES, it is the breech block. ✅

    Here's the new thread were I ask for specific help how to fix it.

    https://www.airgunnation.com/topic/p700w-breech-block-is-loose/

     

    Matthias

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    KatoKevin454
    Participant
    Member
    United States
    Accuracy: +10

    Sounds like your Dremel caused the breech block to loosen up, (Vibration) hope you got it fixed….. ;)

     

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