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Changing silencers effecting zero massively...

Discussion in 'Anything Airgun Related' started by Bane Bastion, Jun 28, 2014.

  1. Bane Bastion

    Bane Bastion Well-Known Member

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    I recently bought a new whisper 180... My rifle is fitted with a 1/2unf that did the job just fine... I simply screwed the 180 on and the zero is way off... I mean WAY off... I'm looking at some shims to get the zero back but surely it shouldn't effect it that bad...

    Ideas please... :)
     
  2. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Are the pellets clipping the silencer?? how much is "way off"

    somtimes when changing silencer, zero will change as it will change the harmonics of the barrel.
     
  3. terry1001

    terry1001 Major Poster

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    Fitting a silencer should have little effect on the point of impact. Try without a silencer first to establish a reference then try your original to see how that compares. Then try your new one.
    It does sound as though the pellets may be touching somewhere in the silencer so you should have a look for signs such as faint grey marks or tiny shavings of lead. Don't just try shimming the scope as the problem is almost certainly one which can be solved by working on the silencer.
     
  4. metalman

    metalman Big Poster

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    If you have a free floating barrell, any change in weight of moderator will affect poi, albeit not massively
     
  5. milek

    milek Honorary Member

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    Every silencer I have used changed the POI on every gun I put them on. Admittedly only an inch at most but change it did.
     
  6. Bane Bastion

    Bane Bastion Well-Known Member

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    It's an s400 with a barrel band, and by way off I mean 3ft high and a foot to the right... The rifle is spot on and the only difference is the change of silencer
    .. Maybe it's clipping, I'll check for marks when I finish work... I've never known such a drastic change...
     
  7. Kenbarcon

    Kenbarcon Donator

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    3ft high and a foot to the right...........at what distance are you shooting?
     
  8. npmair

    npmair Engaging Member

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    The use of a silencer affects the POI, only by a few mm though, maybe by an inch in extreme cases. It also may affect the group size, for the better ot the worse!!

    Here is an example of such effects:
    View attachment 99093
    (all shots were taken aiming at the cross)

    Deviation of feet, most certainly means that something is drastically wrong with the interaction between barrel - silencer, or maybe, the internals of the silencer.
     
  9. Bane Bastion

    Bane Bastion Well-Known Member

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    At 20m... :eek:
     
  10. mattyts

    mattyts Donator

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    pellets are most likely clipping and tumbling then.
     
  11. Bane Bastion

    Bane Bastion Well-Known Member

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    Other silencers work fine... Something must be up with it... Ho hum, it's going to have to go back... :/ Cheers lads...
     
  12. Bane Bastion

    Bane Bastion Well-Known Member

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  13. mattyts

    mattyts Donator

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    Any silencer can clip,only takes one set of threads to be mis aligned or a mating face not properly machined and all the unit is knocked off.
     
  14. Kada82

    Kada82 Busy Member

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    What are the internals llike in that silencer. I had 2 carbon silencers which had a grey inner tube on 15 rifles the pellets came out sideways apart from one gun my hpa ratty. I think it was down to the baffle/tube design the air just bounced about & flipped the pellet
     
  15. Dag

    Dag Pro Poster

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    Interested to see that comment Terry as I almost always shoot with a silencer fitted to my tX and removed it a week or so ago at the range and found about 2" difference in POI. On remarking how surprised i was other members said it is always the case. I think I'll experiment again and see whether it is rifle performance or my hold that is affected.
    Dag
    I do like the chart npmair attached to his post. I think I'll copy that myself unless he cares to attach a blank one to his next post;) Ta!
    Dag
     
  16. npmair

    npmair Engaging Member

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    Dag, there nothing special in the chart. Just an A4 size, 160gr paper with some lines drawn, according to the need of the particular "experiment".
    When finished, I place a suitable contrasting backgroud behind the paper (so that the shot holes show clearly) and I scan it.

    Usually I take notes by hand, but when I want something more presentable, I import the scanned image into a powerpoint slide and I type the information I want to include.

    Feel free to copy it and extend the idea to your particular needs.
     
  17. Bane Bastion

    Bane Bastion Well-Known Member

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    I had the same thought, so I removed all of the insides and tried again... It was still clipping the end cap... It's definitely not aligned properly, and it's not the internals... Seems it's just machined badly... It's a 50 mile round trip to return it too.. Balls...
     
  18. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    That's a bummer mate, because of the law about posting silencers!!

    is it not something that could be fixed on a laith??
     
  19. Bigant

    Bigant Posting Addict

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    far as i know the law is about posting *New* ones and as this one is now second hand...
     
  20. TORNADOS7

    TORNADOS7 Top Poster

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    It's the same on my "Venom Viper" put my "Weihrauch HE" on and I gotta re-zero, change over to the "Daystate mk6" and gotta re-zero again !

    The only thing that's bugging me at the moment is the rifle isn't as accurate with either silencer on-board as it is without one !!!

    And no it's not clipping so I presume it must be the change in air pressure !!!
     
    Last edited: Jun 29, 2014

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