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Hw100

Discussion in 'Technical' started by Scots Bob, Dec 2, 2019.

  1. Scots Bob

    Scots Bob Donator

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    IMG_2508.JPG Hi sorry if this is a stupid question but I am having a nightmare with a Hw100 .Can a poorly set up regulator and hammer spring cause inaccuracy problems . Reason I ask this rifle has been back to Hull cartridge Twice first time accuracy problems and underpowered,got returned power turned up to 11.5 and a test card to say it was accurate,second time accuracy problems got returned with a new Barrel which was good for the first month and now it's lost power and accuracy.I tested with a Chrono and here are the figures to show how low it is . I really don't know what to do now surely I can't be that unlucky to have two bad barrels your advice on what to do next would be much appreciated.
     
    Marky-Boy likes this.
  2. mikeyhall1

    mikeyhall1 Amazing Poster

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  3. BallisticBill

    BallisticBill Keyboard Hero

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    What pellets did HC use when they reset the power? Are you testing with the same pellet (and preferably same batch) and did you test immediately on return? Are you testing at the same temperature? Have you changed the reg pressure since return? Have you cleaned the barrel?

    HW100 have had barrel issues and temperature related lubrication issues. Accuracy loss could be something like your barrel is ok with the H&N at higher temperatures but not when the temperature drops. But the power seems exceptionally low. Do you have a breech leak?

    Edit:
    You didn't say what calibre. I'm assuming .20 judging by the pellet weight. Are you using correct weight for your energy calculation?
     
    Last edited: Dec 2, 2019
    Blackmax and Scots Bob like this.
  4. The burpster

    The burpster Posting Addict

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    Are you using pellet lube and how often or not have you cleaned the barrel? You also don’t say what the inaccuracies are. Is it a general spread or vertically? That is not a huge spread of FPS. It’s not amazing but it’s not that bad. The .177 barrels are not that bad, there has been some iffy .22 ones but not so much .177 you don’t say.
     
    Scots Bob likes this.
  5. BallisticBill

    BallisticBill Keyboard Hero

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    2016 .177 batch machined the wrong way round. The HW110 received a lot of bad reviews but the same barrels were also used in the HW100.
     
    Last edited: Dec 2, 2019
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  6. Scots Bob

    Scots Bob Donator

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    Sorry guys it's a 20cal ,Hull tested with weihrauch pellets at 25 yards,when I came to test them they weren't that good and terrible at 40 yards the barrel has been cleaned constantly unlike my 1.77 barrel which never needs a clean. The best pellets buy far are the H&Ns.Every thing is correct with the Chrono I've checked it against my 1.77 . Pellets are always lubed I just can't understand why it would loose power and accuracy again . Thanks for your replys it's much appreciated I just think the problem is beyond me !
     
  7. HW100Tuning

    HW100Tuning Jaja Ding Dong

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    Newer .22 barrels on the HW100 seem very prone to fouling - quickly. First stop, clean the barrel.

    If that doesn't fix the loss in power it is either one of two things... either the main spring is worn - the springs they use recently have been a bit suspect or more than likely the regulator pin is getting trapped/squeezed by the main inlet valve o-ring - a very common problem.

    The problem is such that Weihrauch are now shipping HW100 pistons that have fluted pins on them (like the HW110) in an attempt to fix it ;)


    **** Edit: our latest posts crossed -

    It does sound like a crappy barrel (rough inside) - but the massive drop in power is almost certainly the main inlet valve restricting air to the reg (trapping the pin as mentioned earlier)

    The main inlet valve is described as a non-serviceable item by HC and Weihrauch. Although we have developed an easy way to service them that guarantees no trapping.
     
    Last edited: Dec 2, 2019
  8. Scots Bob

    Scots Bob Donator

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    Thanks very much it's appreciated
     
  9. HW100Tuning

    HW100Tuning Jaja Ding Dong

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    Added info to my post above
     
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  10. BallisticBill

    BallisticBill Keyboard Hero

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    The .20 cal Weihrauch pellets are JSB manufacture? H&N FTT will give lower power but not that much unless very tight. Is the power loss the same with the Weihrauch pellets?

    The thing I can't fathom is, if it's a leak or main inlet valve o-ring it's giving unusually consistent power. That wouldn't explain vertical stringing, if that's what you are seeing.

    In answer to your final question, "what to do next," I'd phone HC and talk about sending it back. Is it under warranty? If so, and they can't fix it, you could be looking for a replacement or your money back.
     
    Scots Bob likes this.
  11. HW100Tuning

    HW100Tuning Jaja Ding Dong

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    @Scots Bob - Have you done the tissue test?

    take scope off get tissue paper (split it to single ply) and drape over the breech where the mag would go... then fire, does the paper move? If it does you could be missing a breech o-ring.
     
    Last edited: Dec 2, 2019
  12. Scots Bob

    Scots Bob Donator

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    Hi Bill it's out of warranty now and they have assured me that its accurate it was only returned to me in October i don't think they would be interested now.
     
  13. Scots Bob

    Scots Bob Donator

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    Thanks I will try it tomorrow I've cleaned the barrel as well so I can test it again for accuracy.
     
  14. HW100Tuning

    HW100Tuning Jaja Ding Dong

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    Also make sure the cocking arm linkage is not bent (even slightly) - this will stop the pellet probe engaging fully (leaving a gap for air to escape). The one in the pic is a bad bend... but even a slight curve will give you problems.
    defect_002.jpg defect_003.jpg defect_001.jpg
     
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  15. Sean110

    Sean110 Busy Member

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    Im 100% sure i was told by Tom at HC that everytime a rifle is sorted you automatically get a years warranty, so if it was done in october you still have another 10 months to go

    .
     
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  16. HW100Tuning

    HW100Tuning Jaja Ding Dong

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    That would be a result - nice info :up:
     
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  17. Scots Bob

    Scots Bob Donator

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    Thanks so much for your advice
     
    HW100Tuning likes this.
  18. BallisticBill

    BallisticBill Keyboard Hero

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    So it's been back twice under warranty? Only October! If the problem started while under warranty and it's still not fixed I'd be talking to them about sorting it f.o.c. You need to be sure about the performance and have tested the power with the same pellets. Talk to HC so you can agree what tests you do and what evidence they need. Stay calm and express disappointment (I've had good response before) but you will need to do your homework. :thumb:
     
    Scots Bob likes this.
  19. Blackmax

    Blackmax Forum Rude Guy

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    Hi Bob,
    Just picked this up. As per our chat Saturday it sounds like it may well be the hammer grease solidifying as your using it in sub zero temperatures. This is a well documented and issue and with a drop like that it's likely to lead to accuracy issues.
     
  20. Scots Bob

    Scots Bob Donator

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    Thanks Bill I will put some pellets through it tomorrow weather permitting and see if another barrel clean has helped as for the problems its been on going since I bought the rifle last October
     

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