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Calling Hw97/77 Owners...

Discussion in 'Technical' started by Jamex2.2, Jun 14, 2019.

  1. Jamex2.2

    Jamex2.2 Engaging Member

    Messages:
    124
    Likes Received:
    42
    Location:
    Weybridge
    I am chasing consistency with my 2 1/2 year old .177 gun. I have a newish 12FPE spring preloaded to appr 83% of the available compressed space giving 10.4 FPE average with AADF 8.4 grain pellets. However output with pellets straight out of the tin is very variable. I tried a smear of STP (neat) on the crown and average FPE increased by about 3% to 10.7 FPE and was more consistent. I fitted a new breech seal, but this has not yielded the expected gains. The breech seal is definitely compressing, the underlever goes slack about 15mm from closure (when the breech seal mates with the crown) and can be felt to just pull the seal tighter as it fully shuts. I am expecting a lower POI when I next shoot due to the "flexture" at closure pushing the barrel down.

    Do you store your gun with the underlever unlatched? I have read of owners using a spacer to keep the compression tube away from closure when stored ( not for me ).

    Any other ideas please? Are there better breech seals than standard HW ( ducks quickly )?
    Thanks for reading. Cheers , James.
    (PS - the piston seal HW, is also new and unsized running STP/graphite mix (thanks Bigtoe). No dieseling. )
     
  2. JD

    JD Donator

    Messages:
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    937
    Location:
    Dorset
    How tight is the piston seal in the com tube ?
     
    Deejayuu likes this.
  3. Jamex2.2

    Jamex2.2 Engaging Member

    Messages:
    124
    Likes Received:
    42
    Location:
    Weybridge
    It slides pretty well with the STP/graphite mix. I tried resizing the last seal and am wary of trying this again.
     
  4. JD

    JD Donator

    Messages:
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    Location:
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    Are you using a new standard Hw seal ? As I really don't rate them that highly.

    Sizing a seal takes time, new style Hw seals don't lead themselves very well to this, because of the design.

    The lip being proud, instead of the old style being parallel ( more or less ) front and rear.

    I could ask many questions but the bottom line is.

    A decent spring ( Titan, V Mach ) well fitting guides, good lubes and a piston seal ( Aussie green or red or old style Hw ) and aim for around 11-11.5 fpe from the start.

    Should see consistent results on the chrono and at the target.
     
  5. StellaArtois Sr

    StellaArtois Sr Springer Whore

    Messages:
    1,743
    Likes Received:
    1,115
    Location:
    Hertfordshire.
    My first thoughts are that you say there are a lot of new parts recently added to your rifle. I would personally. Give it time to settle the new parts in and put at least half to a full tin of pellets through it, make sure the barrel is spotless and try some different pellets. I find official breach seals are fine.
    I always keep all of my underlevers closed, that's how they were designed to be, not personally heard of them being left undone. Would be like leaving a break barrel half cocked. I am sure other people with have thoughts about that.
    Ade :thumb:
     

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