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Thread: Weihrauch HW100 T has become completely inaccurate

  1. #61
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    Quote Originally Posted by jepho View Post
    Thanks for this response. The cleaning was carried out with Napier and patches on a pull-through. I guess the point about corrosion in the barrel through moisture is a possibility. The house is kept at an even temperature and does not suffer during the cold weather. Moving from well heated to a cold environment could potentially provoke condensation and that may provide enough moisture to corrode the barrel. When I inspected the barrel from both ends against a strong light source, I could see no variation in lands or rifling grooves. Good point about the action block. It is very firmly bolted together.
    Think the barrel has got to come off! And what I would call "a good proggle about".
    Looking at one of the earlier posts I would suspect something in the barrel. Either a patch of corrosion or very stuck lead.

  2. #62
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    a great summary... thank you!

    Quote Originally Posted by zephyr View Post
    To recap:

    The rifle grouped well, then the next time you used it (and subsequent times) it won’t group.

    A gunsmith reported the barrel was straight, but a little loose. It has been tightened and it still won’t group.

    The same gunsmith said the silencer was bent. You have shot the gun both with no silencer and with a new one, it still won’t group.

    You have cleaned the barrel, it still won’t group.

    You are using pellets from the same tin that previously grouped well, but it doesn’t group now.

    You are experiencing the same problem with all the types of pellet that previously grouped well.

    You have tried another scope and still it won’t group.

    You have looked at the barrel internally and cannot see anything.

    You have looked at the breach end and crown of the rifle and cannot see anything.

    You have the same problem when using different magazines.

    You have looked at the magazines and cannot see anything.

    You do not think anything you, as the shooter, is doing is different.

    The barrel band you feel is not the issue.

    You have tightened the stock/action, it still won’t group.

    You say the gun hasn’t been damaged.


    Indeed a confusing position. It sure sounds like the pellets are being damaged in some way that is giving an inconsistent trajectory. The one thing that stands out to me from all your posts, is after cleaning the barrel the grouping changed for a short while, this surely has some significance. Fingers crossed the gunsmith finds the answer.

    Ooo! An afterthought, can you video the pellet in flight in slow motion to see how it is flying?
    Thank you for an excellent summary. I could try and video the pellets in flight when the gun is returned to me. I do believe something is causing the pellets to go wherever they are driven to go. I think that the fault being inconsistently inconsistent is making it difficult to get any purchase on the issue. Three scopes, multiple cleanings, multiple pellets, two moderators, no moderator and no obvious physical cause. I hope my gunsmith is as good as the local folk are saying.
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  3. #63
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    Quote Originally Posted by Phil Russell View Post
    I am following this thread with interest as it intrigues me. All the comments about the barrel: would there be anything to be gained by loosening the barrel, turning it through 90 degrees and tightening it again? Asked in complete ignorance as the barrel may be screwed in then secured, in which case my comment may be utter rubbish.
    Cheers, Phil
    Thank you for your response. I suspect that the barrel being loosened and turned through 90 degrees wont really provide an insight. As the shots can go anywhere in a 360 degree circle, there is no tendency towards the shots all leaving the barrel in the same manner at landing at approximately the same place. This would mean that a 90 degree turn would no show anything new and would not confirm anything other than what is already known.
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  4. #64
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    Proggle? 🤪

    Quote Originally Posted by simesgee View Post
    Think the barrel has got to come off! And what I would call "a good proggle about".
    Looking at one of the earlier posts I would suspect something in the barrel. Either a patch of corrosion or very stuck lead.
    Thank you. I have no idea what a proggle is... or even if it is legal. 😁A proggle may be just what the doctor ordered but I am not sure if my gunsmith can provide one. 🤣(note to self:...check with gunsmith as to the type, duration and cost of a proggle)

    I suspect that you are correct and that the barrel needs more of an inspection than I can give it. I know that an X-ray examination would reveal any stuck lead. Corrosion would have to have occurred over a time period and being time-dependent, I think that the performance of the gun would have slowly drifted out of kilter. If it was great last week and terrible this week, I would suspect something has gotten into the pathway of the pellets.The barrel looks smoother than a baby's bum.
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  5. #65
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    I would try manually loading single pellets carefully with some tweezers and would use a pellet known to be good with most HW100 barrels.

  6. #66
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    Just a thought...… have you tried removing the barrel from the rifle and inserting a pellet in the breech end and manually pushing it through the barrel in order to see if you can feel any tight spots anywhere along the length of the barrel?
    Be careful with what you use to push the pellet through the barrel. Something firm but relatively soft compared to the steel of the barrel (maybe a brass or aluminium rod) should do.
    There could be a tightening of the barrel at the muzzle end, called a choke, and it is to be expected.
    Examine your pellet for land marks, grooves left on the pellet by your barrel. Hopefully this would eliminate that your barrel is not causing any damage to your pellets and causing your grouping issues.
    Hopefully your gunsmith will return your rifle to you in full working order.

  7. #67
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    Quote Originally Posted by Shedder View Post
    I would try manually loading single pellets carefully with some tweezers and would use a pellet known to be good with most HW100 barrels.
    Thank you for the suggestion.

    That sounds like it is possible. Manually loading pellets has me concerned for the notion that the use of the action probe will almost certainly push the pellet on axis. Manually loading, especially with tweezers, may cause the pellet to be loaded off axis. What is your take on that possibility?
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  8. #68
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    Quote Originally Posted by Maximouse View Post
    Just a thought...… have you tried removing the barrel from the rifle and inserting a pellet in the breech end and manually pushing it through the barrel in order to see if you can feel any tight spots anywhere along the length of the barrel?
    Be careful with what you use to push the pellet through the barrel. Something firm but relatively soft compared to the steel of the barrel (maybe a brass or aluminium rod) should do.
    There could be a tightening of the barrel at the muzzle end, called a choke, and it is to be expected.
    Examine your pellet for land marks, grooves left on the pellet by your barrel. Hopefully this would eliminate that your barrel is not causing any damage to your pellets and causing your grouping issues.
    Hopefully your gunsmith will return your rifle to you in full working order.
    Thank you for this helpful suggestion.

    I have not tried that method of detecting an obstruction. It sounds like it could help to identify any faults in the barrel; similar to a ballistic examination of a fired projectile. I guess the gunsmith will follow this type of examination process while looking for the cause of the problem. If the rifle gets returned in its current state, then I have now got another point from which to start investigating the issue. Good point about using something softer than the barrel to push the pellet through. I figured a wooden stick of the approximate dimensions (cleaning rod without the metal jag attached) would serve this purpose.
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  9. #69
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    Quote Originally Posted by jepho View Post
    That sounds like it is possible. Manually loading pellets has me concerned for the notion that the use of the action probe will almost certainly push the pellet on axis. Manually loading, especially with tweezers, may cause the pellet to be loaded off axis. What is your take on that possibility?
    The breech of the barrel should have a bit of a tapered throat in to it to assist in aligning the pellet to the bore. By inserting a pellet directly into this throat using tweezers and seating with the probe would hopefully serve to rule out a potential magazine alignment issue.
    People who have been there focus on the fundamentals. People who sit at keyboards all day focus on the trivial and inane.

  10. #70
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    There is a thread about this type of issue on the Weihrauch Owners Club website. I suggest you visit the site to get an insight of what happened in their case. It’s in the PCP section, page 3 and the contributor is Mitchell 1992.
    They cleaned the barrel and it still shot badly and then it suddenly changed to a tack driver after it had leaded in, but only after several hundred shots. I wouldn’t necessarily blame your gunsmith, most can strip down guns but air gun problems are harder to pin down and rather fickle at times. If he is an airgun tuner or specialist he would have more insight than a normal run of the mill gunsmith.
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  11. #71
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    Your barrel appears to be the culprit, give a really good going over with a wire bush, it cant make it any worse.

  12. #72
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    Quote Originally Posted by rockdrill View Post
    The breech of the barrel should have a bit of a tapered throat in to it to assist in aligning the pellet to the bore. By inserting a pellet directly into this throat using tweezers and seating with the probe would hopefully serve to rule out a potential magazine alignment issue.
    Thanks again. I will wait until the gunsmith gives me the rifle back or tells me it is fixed. I can then try this if the problem remains.
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  13. #73
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    Quote Originally Posted by Norfolkngood View Post
    There is a thread about this type of issue on the Weihrauch Owners Club website. I suggest you visit the site to get an insight of what happened in their case. It’s in the PCP section, page 3 and the contributor is Mitchell 1992.
    They cleaned the barrel and it still shot badly and then it suddenly changed to a tack driver after it had leaded in, but only after several hundred shots. I wouldn’t necessarily blame your gunsmith, most can strip down guns but air gun problems are harder to pin down and rather fickle at times. If he is an airgun tuner or specialist he would have more insight than a normal run of the mill gunsmith.
    Thank you for the very helpful response.

    I visited the WOC site and pages suggested by you. The issues discussed certainly seem to mirror my own experiences. The first gunsmith I had used was less than clear about what the issue was. My BS detector went into overdrive when I was told that the moderator was bent out of true. (it wasn't) The fitting of the brand new Huggett moderator, as suggested by the gunsmith, made no difference; nor did firing the gun without a moderator.

    There is no shame in not knowing but true ignorance is the refusal to learn anything new. He was supposedly an airgun expert, whatever that might mean. I paid a total of £115 to be no nearer to any sort of answer. The gun has now gone to someone locally, who is recognised as an excellent gunsmith where air rifles are concerned.
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  14. #74
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    Quote Originally Posted by Lavant_Lad View Post
    Your barrel appears to be the culprit, give a really good going over with a wire bush, it cant make it any worse.
    Thanks again. Yes, I am coming around to the idea that the barrel has somehow developed a fault. My gunsmith should be able to make the necessary tests and then tell me what the solution will be.
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  15. #75
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    weihrauch hw 100

    hello jepho have you checked that the pellet breech seal is ok and not worn, as this will also make it very inaccurate. as air will blow out of breech and will sound very loud.or louder then normal if you do need seals try hw100 tuning web site .

    if you look at weihrauch owners club for info to fit seals your self it's not that hard just read up on it. and take your time in doing it, in replacing, seals if needed, good luck.

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