1. The Forum Rules have undergone some minor changes and updates.  Please take the time to read them; it will only take a couple of minutes of your time. By doing so, you lessen the chance of incurring the wrath of the moderation team or making yourself look foolish to other members.

    90% of users posting adverts in the Sales forums need to be reminded to read the rules as their posts are wrong.  This is unnecessarily time-consuming and will no longer happen - if your advert doesn't follow the Sales Rules it will be deleted and you'll have to start all over again.

    To close this box once you've read it (and the Rules), click on the X in the top right-hand corner.

    Thank you.

    AGF Staff



    Dismiss Notice
  2. A reminder of one of the Forum Rules:

    'Behaviour

    Do not make inappropriate or offensive posts - including threats, harassment, swearing, prejudice, defamation, deliberate insults or name-calling, other negative remarks about this forum, its moderators and administrators or your fellow members. Even if this is just your own personal opinion, RESPECT YOUR FELLOW MEMBERS.'

    There have been changes made to our censoring software in an attempt to help with this growing problem.

    Click the X in the top-right-hand corner to dismiss this notice.
    Dismiss Notice
  3. Dear members,

    Our membership (like our country) consists of people from all walks of life; different in far more ways than can be listed here and each with a different view based on their experience of life - regardless of their colour, religion or cultural heritage. Every single person in the UK has been born of mixed race – we are a multi-coloured and multi-cultural country.

    As many of you are aware there are a handful of individuals amongst this membership that persist in making provocative, inflammatory, racist and otherwise offensive comments. This has been happening across the forum to a certain degree but is most especially prevalent in the Adult section.

    The moderation team has tried to stay on top of this, however unfortunately because of the ‘offensive’ nature of much of its content we don’t monitor the Adult section quite as much as perhaps we should. As a result much of this behaviour has gone unnoticed unless it has been reported to us. While the team always intended to take a "light touch" approach to the Adult section it would seem that some people aren’t quite adult enough to be left unmonitored after all.

    This behaviour is, and always has been against Forum Rules as well as the specific stipulations of the Adults forum and it will no longer be tolerated. We feel it's time to draw a line in the sand and as such from this point onward offenders will receive an immediate and permanent ban from the forum.

    In order for us to achieve our goal of restoring the forum to the friendly and tolerant place it once was, we ask that ALL members be mindful of the content they post and help us to stop unacceptable behaviour by using the 'Report' tool at the bottom of any offending post - the results of which can be seen only by Admin/Moderators.

    You should all receive a copy of this message by PM. 

    To close this message box, click on the 'X' in the top-right-hand corner.

    Dismiss Notice
  4. Hotmail block emails from us entering your inbox. Unless you can setup a safe sender you will not get activation emails from the forum. Please use an alternative provider or complain to Hotmail.
    Hotmail addresses include.

    @Hotmail.co.uk @Hotmail.com @outlook.com @Live.com
    Dismiss Notice
  5. Postings on Politics, Religion & Controversial Off-Topic Material

    The majority of users do not want to read about these subjects and people have left the forum as a result of it – this is after all an 'Airgun' Forum. It’s all very well to say they don’t have to read it if they don't want to, but as most of us use the ‘New Posts’ button there is no easy way to avoid it.

    All AGF staff members are in favour of people being able to discuss what they want, but we have to draw the line somewhere if it is upsetting other users. We don’t want to read about these topics either.

    IMPORTANT- The discussion of politics and religion is no longer allowed anywhere on the forum (including the Adult section).  The only exception is if it's airgun related - they must be put in the Airgun Related Politics section..

    We will not tolerate bullying or personal attacks, racism or any other offensive 'isms'. we will remove these topics from the forum, we will not give you an area where you can abuse each other. We will not hesitate to ban offenders.

    To clear this text box, click on the 'X' in the top right-hand corner.

    Dismiss Notice

Newbie question - front zero

Discussion in 'Technical' started by CNP1974, Jan 22, 2017.

  1. CNP1974

    CNP1974 Well-Known Member

    Messages:
    69
    Likes Received:
    6
    Location:
    Middlesbrough
    When I bought my 177 hw100 the guy put it through his chrono at 11.47 ftlb using exacts weighing 8.44gr. My scopes are the hawke 6 - 24 x 50

    Can somebody work out for me what my forward zero would be if my back one was set at 30m please?

    If say my forward zero is 15.1m does that mean I can zero at 15.1m and then my back sight would automatically be zeroed at 30m?

    I have enough room to zero at home to about 20m. It would be handy if I could be just about zeroed in when I arrive at my permission as the jackdaws don't fly off until I get out of the car. I reckon I can pick one or two off first.

    Lastly, what is the maximum weight of pellet I can use when out shooting rabbits to about 40m



    Thanks in advance CP
     
    Last edited: Jan 22, 2017
  2. Deggy

    Deggy Donator

    Messages:
    795
    Likes Received:
    1
    Location:
    Stoke on Trent
    I have a HW100 with a 6-24 Sidewinder on it and zero at 30yds, I find that the rifle is pretty much zero 20-35 yds.
     
  3. OzzyJ

    OzzyJ Donator

    Messages:
    2,394
    Likes Received:
    0
    Location:
    Aylesbury
    Download ChairGun and have a play. It will give you some idea but no substitute for checking in the field
     
  4. CNP1974

    CNP1974 Well-Known Member

    Messages:
    69
    Likes Received:
    6
    Location:
    Middlesbrough
    I've played with the chair gun app. Just wanted it double checking to be honest. I don't know whether my scope is getting knocked when I'm travelling but it's never been zeroed the same twice when I take it back out.
     
  5. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

    Messages:
    17,277
    Likes Received:
    7,891
    Location:
    St. Andrews, Jockland.
    use the most accurate pellet regardless of weight.
     
  6. CNP1974

    CNP1974 Well-Known Member

    Messages:
    69
    Likes Received:
    6
    Location:
    Middlesbrough
    Can I do my back zero by zeroing at home on my front zero?
     
  7. Shotaholic

    Shotaholic Busy Member

    Messages:
    500
    Likes Received:
    379
    Location:
    Somerset
    Yes. As others have said, if you play with Chair Gun you will see that if you set the far zero at say 50 yards and note what the near zero is and then change the zero point to whatever the near zero is the graph will remain unchanged. Pellets describe an arc and will pass through the scope sight twice - near and far. It doesn't matter which zero you choose, either near or far - it's up to you. The only thing I will say is that if you choose the near zero you'll have to be very precise as any small discrepancy here will be magnified at the far zero. The other thing you'll need to be very precise about is all the other entries you make in Chair Gun as any discrepancy will change the flight arc and hence the near and far zero points.
     
  8. Gunfun

    Gunfun Engaging Member

    Messages:
    2,781
    Likes Received:
    1,363
    Location:
    MANCHESTER
    I would not take a shot at 40m live quarry after only zeroing on my first zero, you could be inches out at 40m.

    First you need to check your Chairgun holdover/windage results on paper targets at 10, 20, 30, 40m, once you've established that then maybe set up a permament discreet 20 and 40m zero target on your permission and check zero before starting hunting. After a few trips you'll know how well your combo holds zero and you may be able to take shots straight away when arriving at your permission.
     
    Last edited: Jan 23, 2017
  9. Jamesplumber

    Jamesplumber Well-Known Member

    Messages:
    76
    Likes Received:
    0
    Location:
    Scunthorpe
    At about 27-30m zero you won't have two zero points just hold over


    .
     
  10. Jazzyboy

    Jazzyboy Donator

    Messages:
    724
    Likes Received:
    34
    Location:
    Newtown
    I am afraid that is incorrect.

    I zero at 30yds with all my rifles and there is always another point nearer to the muzzle where the pellet crosses the line of sight. Or two zero's.
     
    Last edited: Jan 23, 2017
  11. Jazzyboy

    Jazzyboy Donator

    Messages:
    724
    Likes Received:
    34
    Location:
    Newtown
    I would imagine the near zero to be in the 15-17 yds range TBH.

    Having said that .177's shoot fairly flat from 15 to 35 yds with a little hold under at 20 -25 yds and a little holdover at 35 yds.
     
  12. simonc_here

    simonc_here Engaging Member

    Messages:
    489
    Likes Received:
    1
    Location:
    Didcot
    It's not you know.
    Depending on your set up you can have it so that the pellet gets to the line of sight once.
    I also zero at 27 yards so I have "no" hold under for HFT. Admittedly the programs say it is crossing line of sight at 20 yards as well, but as it only goes above the LOS by 1.2mm @ 23 yards, it is not something I worry about.
    If I set my zero to 23 yards the program says it only gets to (not crosses) LOS once.


    @OP for 780fps JSB exact 8.44 zero at 30 yards gives a 18 yard first crossover.
     
    Last edited: Jan 23, 2017
  13. Jamesplumber

    Jamesplumber Well-Known Member

    Messages:
    76
    Likes Received:
    0
    Location:
    Scunthorpe
    Have a look on chairgun for those pellets and that gun the single zero point is around there, to have two it's a little farther out for the second point


    .
     
  14. Ratdog

    Ratdog Banned

    Messages:
    2,095
    Likes Received:
    7
    Location:
    North Staffordshire
    What the computers don't take into account is and scope misalignment.
    A second or two of misalignment will change the two cross over distances.

    Very rarely does a spreadsheet translate to the fact s taking place at the range!
     
  15. robs5230

    robs5230 Oversprung

    Messages:
    12,682
    Likes Received:
    15,335
    Location:
    bideford devon
    Chairgun is a great tool to plot out trajectories at a given velocity, but as said above will not correct any shooter error or equipment misalignment.
    My advice if you are shooting live quarry is to get it near the mark using your secondary (near) zero then get out to a marked out range and zero properly on your primary (far) zero.
    At this point you will also be able to plot out your holdover at ranges beyond your primary zero.
    Please make sure you get the rifle properly zeroed before shooting live quarry.
     
  16. Blackmax

    Blackmax Forum Rude Guy

    Messages:
    7,894
    Likes Received:
    8,926
    Location:
    Rayleigh
    Not necessarily, HFT guys I know zero at 25 yards so they only hold over, the pellet clips the sight line at that range but doesn't rise above it.

    Other things have an influence on POI such as velocity and scope height above the barrel.

    I do understand what the Op is saying though, to give you some idea, if you had a primary zero of 35 yards then the secondary zero would be about 10 yards and the pellet would rise just over half an inch above the sight line so at 22.5 yards you'd have to aim that high. Chair gun will give you an idea, especially if you use the graphs.

    Your best bet is to get a location where you can fully zero your gun at your desired range and then check the POI at other ranges.
     
  17. bucketboy

    bucketboy Very Active

    Messages:
    4,067
    Likes Received:
    7,627
    Location:
    peterborough
    At sub 12 power levels, high scope mounts will give two cross over points close to your choosen zero(say 30 yards), low mounts give two cross over points, one at your choosen zero the other about half way between gun and zero. But if you choose a longer zero (say 50 yards) both high and low mounts will have two cross over points one being about half way.


    that said, I zero my guns exactly like blackmax describes:up:
     

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