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Advice Using up all my turret windage zeroing

Discussion in 'Anything Airgun Related' started by Capt, Sep 21, 2014.

  1. Capt

    Capt Engaging Member

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    Hi Forum, maybe you can help here please?

    On Friday I removed my scope from a TX200 that had previously been zeroed with no turret windage adjustment required whatsoever, magic! I then mounted it directly to a new S400, a few shots at the range it required virtually all of my turret windage adjustment to centre the POI. I was thinking that my TX rails are bang on & so will be the S400, so could the S400 barrel band be misaligned?
     
  2. terry1001

    terry1001 Major Poster

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    It is possible for the barrel band (certainly on the 410) to be twisted out of alignment after a knock etc. It should be clamped to the tube with a couple of grub screws, slacken these off and allow the barrel to move to its natural position and then re-tighten the grub screws.
    Another possibility is that the scope mounts aren't fitted correctly and one or the other may not be aligned properly in the dovetail so check it visually and slacken off the screws (remove the scope first), just nip them up and then refit the scope nipping up those screws. When everything is in the right place you can tighten all the screws a bit at a time until it's firmly mounted.
     
  3. sharpsman

    sharpsman Pro Poster

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    Yes its a common thing with them as they are easily knocked.
     
  4. TORNADOS7

    TORNADOS7 Top Poster

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    If I remember ritely the barrels are set under tension at the factory !...:up:
     
  5. Capt

    Capt Engaging Member

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    Just loosened them, can't believe that's all supporting & aligning the front of the barrel. If this is the case, the assembler at AA theoretically could have tightened the filling cap on the barrel band & then the grub screws causing a slight misalignment.

    Will have to try it TMOZ, thanks for the advise.
     
  6. Capt

    Capt Engaging Member

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    tension in what way?
     
  7. terry1001

    terry1001 Major Poster

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    No, the barrel band is a support and the barrel simply sits in an o ring which is intended to stabilise the barrel. Some people (especially target shooters) like to remove the o ring and let the barrel free float or even get rid of the barrel section of the clamp. For hunting use I think this may be unwise.
     
  8. Capt

    Capt Engaging Member

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    Well loosened it off & nipped up the grub screws but has made no difference. Put the scope back on the TX & is still bang on centre & centred on the windage turrets, loosened all scope mount screws & re tightened still bang on with the TX. Put I back on the S400, but it's still out the same. Email off to AA for an explanation.
     
  9. Capt

    Capt Engaging Member

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    Well the saga continues..............

    The S400 is back from AA after 6 Weeks they report there is nothing wrong with it!!! Before mounting anything the chamber has come back scratched, thanks AA. Just mounted two different scopes in the middle of the windage turret turns & the POI is still an inch right at 10 yards & still uses most of the windage to zero at 35 yards. To correct this the only thing I can think of is use fully adjustable mounts but how can this be right in the first place? I have loosened the barrel band, still no better, think I got a bad one but can't seam to get AA to accept my findings. Will have to think twice now about purchasing anymore of there guns. Not happy at all or am I doing something fundamentally wrong?

    Can any of the forum shed any light on this I wonder?
     
  10. sej016

    sej016 Donator

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    The only suggestion I ever received for this problem was to turn the mounts by 180 degrees, i.e, the other way around. Sometimes it can make a difference.

    You might try swapping front for back, too? (But not at the same time).
     
  11. terry1001

    terry1001 Major Poster

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    If the barrel band isn't causinf a problem then you could look at the mounts themselves. Are they properly fitted to the dovetail? Sometimes the clamps don't fit very well or they might be a burr which is stopping the base fitting properly into the dovetail. You might try the suggestion from sej016, swap the mounts over front to back, keeping the screws on the same side as they are now or you can just turn both mounts through 180 degrees, unfortunately some mounts aren't well made.
    If this doesn't do the job then you may have a slightly bent barrel, this is quite common as it's quite difficult to make one that is dead straight and with the bore completely concentric. Yo check this you would need to loosen the barrel and with the rifle clamped firmly fire a series of shots, rotating the barrel about 30 degrees each time. It is likely that you will get a circular pattern of holes in the target indicating that the barrel is bent. It's probably best to set it so that the bend is upwards as this will normally help with zeroing. I don't know if this is possible with this rifle or not but someone will know for certain. It is possible to straighten a barrel but it is a job which requires knowledge and care to get it right.
    Hopefully the mounts will be the problem and can be put right simply.
     
  12. sticko

    sticko Well-Known Member

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    I have seen this on Many occasions when they have just come back from aa just loosen the clamp and lightly twist the barrel lock it off should be okay
     
  13. billy.whizz

    billy.whizz Posting Addict

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    im not sure if this is any help, I bought a new a/a s200 which was and is like your a/a400, I didn't send it back even though its under warranty, will try the barrel turn and let you know what happens too mine.
     
  14. Tron

    Tron Donator

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    simplest way to sort your problem is to slack off the barrel support band then if its shooting too far left then gently twist your muzzle to the right while nipping up the band locking grub screws. very easy to do and will give you a certain amount of horizontal adjust on the scope.
     
  15. Capt

    Capt Engaging Member

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    Thanks for all your comments, I am more pxxxxd off that AA couldn't even sort it. I have loosened the barrel band, shot a few through and it still shoots to the right. Three scopes have been on it now all with sports match mounts & still the same so I assume now it's the barrel that needs a little help & reclamp the band. Failing that the barrel must be bent!
     
  16. terry1001

    terry1001 Major Poster

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    Pushing the barrel across with the band is not a long term solution as it is liable to move and as the O ring gets worn it will slowly creep. You'll have to do it properly. You can try a straight edge along the outside of the barrel to see if there is an obvious bend but it might not be visible or it may only be the bore which is out of alignment, possibly only the last inch or so.
     
  17. Capt

    Capt Engaging Member

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    I assume then the barrel can be loosened at the breach block end if I have to try & rotate it? Is it only hand tight or is a special tool required to loosen the collet?

    thanks once more!
     
  18. terry1001

    terry1001 Major Poster

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    I'm not certain how it's fixed on your rifle, there are some experts here who will know exactly how it's done. Sorry.
     
  19. Tron

    Tron Donator

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    With the 400/510 series you can not just slack off the barrel at the receiver end and twist because the brass part you can see at the breech end is glued to the barrel and contains the O ring and the transfer port!. slacking off the barrel and twisting it would severely restrict the power of your rifle if twisted it more than 1/8" would result in no air at all pushing the pellet out. Bit pointless of some of the advisors on here giving you advice when they havent a clue about the correct way to help you with your problem. If you lived closer I would sort your gun out in just afew minutes.
     
    Last edited: Nov 9, 2014
  20. Akita177

    Akita177 The Absolute State of Britian podcast

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    IF you have a silencer/air stripper/muzzle break you could try removing them and shooting again.

    You can rotate the barrel on some guns to find there true north i.e but thats rifles like Sterys that dont have the transfer ports drilled into the barrel.
     

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