43y zero

Discussion in 'Hunter (HFT) & Field Target (FT)' started by Mr C, Nov 4, 2019.

  1. Mr C

    Mr C New Member

    Joined:
    Oct 18, 2019
    Messages:
    22
    Location:
    Cambridgeshire
    Hi i took my new air arms to the club for the first time and my new scope (delta Stryker 5-50x56) I found the top the trajectory was about 43 yards. This seems quite a long zero.
    Is it ok or am I doing something wrong.
     
  2. sven

    sven Active Member

    Joined:
    Dec 11, 2009
    Messages:
    328
    Location:
    Arnhem, The Netherlands
    Club:
    FT Schalkhaar / SSV Ons Genoegen
    Where the top of your trajectory is depends on the range that you have zeroed your scope.
    For instance:
    With a far zero of 30 meters your top of trajectory is at 22 meters.
    With a far zero of 50 meters your top of trajectory is at 30 meters.

    Try some ballistic software to get a better feel for this. I used Chairgun to get the data above.
     
  3. RobF

    RobF Administrator Staff Member

    Joined:
    Mar 4, 2010
    Messages:
    13,225
    Location:
    New Forest, Hampshire
    Club:
    Parkstone Gun Club, South Dorset FTC, Southampton Buccaneers
    Have you got a really high scope?
     
  4. SteveC200

    SteveC200 Well-Known Member

    Joined:
    Jan 19, 2012
    Messages:
    603
    Location:
    Colchester
    Club:
    Iceni Marksmen
    Really really really high. Just chucked some numbers into chairgun, the scope would have to be in the region of 7" off the barrel :eek: for TOJ to be 43 yards or so, presuming hes shooting FT distances and not using it as a mortar. :D
     
    what barn door likes this.
  5. Mr C

    Mr C New Member

    Joined:
    Oct 18, 2019
    Messages:
    22
    Location:
    Cambridgeshire
    My scope hight is 3" its shooting about 11.5 flbs
    So I must be missing something.
     
  6. Adam

    Adam Well-Known Member

    Joined:
    Jan 5, 2009
    Messages:
    1,206
    Location:
    Leeds
    Club:
    Redfearns & the UBC
    If you were starting at closer ranges and moving out to 43, it could be your rifle coming into its sweet spot, or warming up, or settling down etc etc.
    Or if you started longer and moved back to 43 it could be rifle running lower on air.
    Or it wasn't actually 43 yards.
    Or gravity is much lower in Cambridgeshire. :)
     
  7. SteveC200

    SteveC200 Well-Known Member

    Joined:
    Jan 19, 2012
    Messages:
    603
    Location:
    Colchester
    Club:
    Iceni Marksmen
    Presuming 8.4 pellets, chairgun says TOJ is 29 yards. What is it that makes you think its 43 yards?
     
  8. Mr C

    Mr C New Member

    Joined:
    Oct 18, 2019
    Messages:
    22
    Location:
    Cambridgeshire
    The pellets started to drop at 43y that is what made me think it was 43y
     
  9. ksts100

    ksts100 Member

    Joined:
    Jan 22, 2017
    Messages:
    78
    Location:
    Athens Greece
    Something wrong ??
    what raiser rail you use ??
    What tilt has your rail ?
     
  10. Marin

    Marin Member

    Joined:
    Dec 30, 2018
    Messages:
    40
    Location:
    Bulgaria
    I am using UTG DNT06 scope mount base on my LGU and my zero is far forward.
    Most probably your scope is mounted at angle which should be quite visible.
     
  11. Adam

    Adam Well-Known Member

    Joined:
    Jan 5, 2009
    Messages:
    1,206
    Location:
    Leeds
    Club:
    Redfearns & the UBC
    The angle of the scope tube is not the cause of this issue. Angle of the sight line to bore is what determines the trajectory intercepts. If the scope was angled that noticeably to the naked eye he wouldn't be able to get a zero at a normal airgun range as he wouldn't have enough turret travel.

    As Sven says, if you dial your scope for long range, this has the effect of pushing the top of trajectory further away. However playing with one of my setups in Chairgun (FTP, Nikko mk2, AJP rail, scope height 3.03 inch, power 11.5 ft.lbs like the OP), the scope would need to be dialled to about 75 yards to get a peak of 43 yards.
     
  12. Marin

    Marin Member

    Joined:
    Dec 30, 2018
    Messages:
    40
    Location:
    Bulgaria
    Adam, that's exactly what I'm saying. With my current riser configuration I almost run out of turret travel to put my second zero in the 55y range with JSB exact. Not something that I like .. just don't have appropriate riser for the LGU yet..
     
  13. Adam

    Adam Well-Known Member

    Joined:
    Jan 5, 2009
    Messages:
    1,206
    Location:
    Leeds
    Club:
    Redfearns & the UBC
    @Marin OK. I would recommend you get an AJP riser and never look back; I have one on my own LGU. They have an incline built in, and fit perfectly on the LGU rails. Worth every penny!
    Failing that I recommend Sportsmatch adjustable mounts.

    What I was saying though is that is not the issue with the OP's rifle.
     
  14. Mr C

    Mr C New Member

    Joined:
    Oct 18, 2019
    Messages:
    22
    Location:
    Cambridgeshire
    Thanks for all replys when the weather gets better I will do it again and let you know the outcome (if anyone wants to know) regards Chris
     
  15. KeithW

    KeithW Barn door? Where?

    Joined:
    Feb 10, 2012
    Messages:
    315
    Location:
    Nr Sandy, Beds
    Club:
    Cambridge
    I'm sure you are aware of this and might think I'm just being pedantic, but in case any novices are reading this: pellets start to drop as soon as they leave the barrel. It's all about perceived trajectory, caused by the scope being above the barrel, thus the peak of the perceived trajectory will vary according to the height of the scope and where your intercept point is set.
     
    RobF likes this.
  16. Brian.Samson

    Brian.Samson Allowed in Sales Staff Member

    Joined:
    Jun 15, 2009
    Messages:
    3,362
    Location:
    Doncaster
    Club:
    Doncaster Airgun Range
    Mine don't - my mum always told me to shoot for the stars
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice