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Advice Hw 98 - Who Would Be The Best Tuner?

Discussion in 'Anything Airgun Related' started by Hampshire Tog, Jul 15, 2018.

  1. Hampshire Tog

    Hampshire Tog Donator

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    Long story short: Got an HW98 about a month ago. Mounted a Hawke Panorama 4-12 x 50 AO/IR, which had previously proved itself on a TX 200 HC. Cleaned the barrel, Took it to the range and had a play. Put about 200 pellets down it. First learning was it was > 12 ft/lb out of the box and not grouping at all. It dieseled something rotten, sounding on occasion like a centre fire. (Had a separate thread on this a couple of weeks ago.)

    Took it home, degreased the internals. Swapped the spring for another Weihrauch spring I had lying around - same length/diameter etc. and a TBT spring guide and slip washer. (I couldn’t use the TBT top hat as the preload would have been too much though I was surprised that the gun didn’t come with one as standard.)

    Took the gun back to the range. It cocks beautifully. The gun was now knocking out about 11.1 ft/lb with a max spread over 10 shots of 12 fps. Not amazing but not bad either and will settle down in time.

    After some re-zeroing at 30 yds, it started grouping nicely until all of a sudden it sends out a flier. I say ‘flier’ but these errant pellet strikes are consistently about 3 inches under the group at the 6 o’clock mark. Indeed so consistent are these ‘fliers’ that they actually group! Note, I was shooting in nigh-on wind free conditions off a Predator bench rest so the margin for human error was limited.

    I don’t think it’s a pellet thing. As my vanilla testing pellet, I am using AA DFs 4.52s and they work well in my other Weihrauchs.

    These stray shots don’t seem like ‘fliers’ as a result of a dodgy pellet or a bent barrel rather the result of a random but consistent drop in power (if that makes sense).

    Things it could be:

    • Inconsistent hold - would the fliers be so consistent?
    • Scope is broken for some reason (though it hasn’t been knocked that I know)
    • The gun is delivering inconsistent power due to some internal issue. I didn’t pick it up on my string of 10 shots, maybe I should crony a string of 20 shots.
    Q1. Any other thoughts on what it might be?

    Q2. This is clearly beyond my tuning abilities. Who would people recommend as a tuner?

    Thanks in advance for your wisdom and insight.
     
    littleJon365 and Rincewind666 like this.
  2. Rincewind666

    Rincewind666 Moderated user

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    Can I ask how often the "fliers" are . . . E.g. . . . 4 shots ok 5th the flier . . .?
    I've had nearly every HW model on my bench and in bits and I'm very familiar with the 98. (I owned 2) I have seen this before but only once or twice Nd I've managed to work out them problems.
     
  3. mikeyhall1

    mikeyhall1 2018 Forum Nice Guy - Pepe Le Pew

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    Best person IMO is @Blackmax in Essex. I often pick rifles up for him as I cover a major area for work including Hampshire;)
     
    Blackmax likes this.
  4. robs5230

    robs5230 леший

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    I have a couple of recommendations.
    Get someone to fit the top hat and a slip washer. This will involve shortening the spring. Blackmax is a TBT fitter. Till you've done that you wont get the best out of it.

    The predator rest may be too firm. Get something soft under there.

    Lastly, the fifth shot thing could also be part due to a lapse in concentration I reckon. All seems to go well then the flier. Make sure you concentrate all the time. Consider the trigger pull and hone your technique.
     
    Blackmax likes this.
  5. littleJon365

    littleJon365 Democracy unless they disagree

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    Trigger could be playing a part. Get it set up so it doesn’t surprise you.
    My old 98 was running 11.3 and it was very accurate. The only shots that went a stray were my fault rushing or not concentrating. Very accurate rifle, weighs as much as a car though.
     
  6. craigjohnmaz

    craigjohnmaz Busy Member

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    Tuning wise i had a piston lightened glided and stroke shortened by wonky donky and i find it fast and subtle (recoil) with vmach spring and guides, flyer wise is it possibly lock up of the barrel?
     
  7. rich79

    rich79 Lovin the smell of cordite in the morning

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    Check the barrel detente catch, if it's new then it could be gunged up with blueing salts and not locking up as securely, this would make it shoot low, might not be but its a simple thing to eliminate without taking it apart.
     
  8. Hampshire Tog

    Hampshire Tog Donator

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    Sadly, it's not consistent. I could shoot a nice group of 4-5 and then I'd get a low shot. Then maybe another couple on target and then another flier. No real pattern to it. Any thoughts on what the issue is gratefully received.
     
  9. Hampshire Tog

    Hampshire Tog Donator

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    Thank you for your thoughts. I'd agree with the lapse of concentration theory if I wasn't so focused on getting the thing to work. I don't rush the shots and concentrate on my breathing on each one. If I did have a lapse of concentration, I would understand it if the fliers went left or right but not consistently 3 inches below zero at the 6 o'clock mark.

    Thank you also for the Blackmax tip.
     
  10. Hampshire Tog

    Hampshire Tog Donator

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    Thanks for this littleJon. Agreed, the Rekord trigger on the '98 is not as good out of the box as my '98. Honing the trigger was to be the finishing touch once the fundamentals were sorted. Maybe you're right and that's where I should be starting.
     
  11. Hampshire Tog

    Hampshire Tog Donator

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    CraigJohnMaz, thank you for your suggestion. Please excuse my ignorance: What is 'lock up of the barrel'?
     
  12. Hampshire Tog

    Hampshire Tog Donator

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    Thank you for the thought Rich. I don't think this is likely to be the case. I've had the thing apart and given all bits a good clean.
     
  13. Hampshire Tog

    Hampshire Tog Donator

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    As ever, great support from fellow members for which sincerest thanks. I'll make my thanks more tangible with a donation to the forum.
     
    littleJon365 likes this.
  14. rich79

    rich79 Lovin the smell of cordite in the morning

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    You actually cleaned out the detente catch under the breech?
     
  15. Hampshire Tog

    Hampshire Tog Donator

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    Yes, if it's the bit I'm thinking of.
     
  16. Hampshire Tog

    Hampshire Tog Donator

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    Any clues what he charges?
     
  17. mikeyhall1

    mikeyhall1 2018 Forum Nice Guy - Pepe Le Pew

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    Depends on what you want doing mate. It would be worth chucking @Blackmax a PM though I’ll warn you he’s away from the forum I believe until the weekend. Andy has done several Weihrauchs for me and his work is spot on and I consider the cost to be low - but again depends on what you discuss with Andy about what you want doing to it. ;)
     
    Blackmax likes this.
  18. craigjohnmaz

    craigjohnmaz Busy Member

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    Hi, when the barrel is cocked and you bring it back up locked into firing postion.. is there any slight movement up or down? Also is the breech seal seated flush
     
  19. Hampshire Tog

    Hampshire Tog Donator

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    That's the issue! Until I know what the problem is I don't know what I'd need him to do. I'll be sure to drop @Blackmax a mail after the weekend. Thank you for the recommendation.
     
    mikeyhall1 likes this.
  20. Hampshire Tog

    Hampshire Tog Donator

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    No slight movement up or down and the breech seal is flush. I even tried resting a small piece of paper on top of the breech to see whether it blew upwards when firing, hinting at an imperfect breech seal. It didn't move at all. Thanks for the suggestion.
     

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