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Mill Dot Question on Bushnell Scope

Discussion in 'Anything Airgun Related' started by Darren82744, Jun 28, 2015.

  1. Darren82744

    Darren82744 Well-Known Member

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    Guys,
    Are the mill dot increments on a Bushnell Legend Ultra scope the same mill dot spacing as a hawke scope?

    missed a rabbit today that I should not have missed, with one mill dot hold over.

    Checked Chairgun today, and at the range in question it should have been a clean kill.
     
  2. Pidlar

    Pidlar Big Poster

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    which reticles are on both scopes?I use istrelok where thre is a huge database of scope reticles,assuming that the ret on the Bushnell is the DR600 i cant get the the 1 mildot Mark to match any of the ranges for the Hawke rets using the same distances.
    Regards,Stu.
     
  3. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Did you check the holdover corresponded to the distance on paper:)
     
  4. terry1001

    terry1001 Major Poster

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    You need to check on paper, there is an option in Chairgun to calibrate your mil dots.
     
  5. 177

    177 Donator

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    Charigun lists a Hawke mil dot and a standard generic mildot.


    The results are usually the same regardless of which you select, but not always.


    Similarly, the table data sometimes does not match the ret image.


    Bottom line - software is great, range time confirms it though, and should be done before taking your shot on quarry IMHO
     
  6. pernod

    pernod Well-Known Member

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    Perhaps you just pulled the shot and missed. Or maybe a bit of wind pushed it of target. It does happen......
     
  7. broekzwans

    broekzwans Member

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    The mildots in the bushnell (I assume you have the 4,5-14) are calibrated at 14x magnification, the hawkes mildots are calibrated at 10x if I'm correct. So yes there is a difference.

    You can fill in the mildot calibration magnification in chair gun and check the difference. However, I don't think this'll be the reason you've missed, it's only a small difference

    P.S. The bushnell legend UHD 4.5-14x44 is the best scope I own(ed) for the money I've paid for it!
     
    Last edited: Jun 29, 2015
  8. Darren82744

    Darren82744 Well-Known Member

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    Guys
    thanks for the sincere responses.
    like everyone else, there's no chance I pulled it, or wind got the better of me.
    clearly over the top, imho. Going by both the Rabbits reaction, and the sound of the pellet in the back stop
    luckiest Rabbit I know

    ive paid the £4 for istrelock, and no my scopes not in the Bushnell batch

    Back to chair gun, to see where this mill dot calibration bit is!

    it looked like a big mill dot in the scope, but I do love my Bushnells Legend Ultra,s. great scopes, got two now, one new and one second hand, nearly new. Always looking for another one or two though

    darren
     
  9. Darren Petts

    Darren Petts Temporarily Alive

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    The old Legend 5-15 was true at 15x and many other Bushnells are true at 12x making them much less use than closer spaced dots.
     
  10. broekzwans

    broekzwans Member

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    Maybe you had one of those matrix rabbits, sometimes they seem to duck before the pellets reaches them. You're shooting below the speed of sound so they hear the muzzle blast before the pellet reaches them which gives them time to respond. Rabbits have fast reaction capabilities!

    My only explanation if you didn't pull the shot or the wind picked it up.
     
    Last edited: Jun 30, 2015
  11. GPConway

    GPConway Engaging Member

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    The Hawke Mil-dots reticles are calibrated at 10x (or 20x for the 20x 1/2 Mil-dot or the new 20x TMX) but Mil-dot reticles from other manufacturers may be calibrated differently - randomly even. So, if you're not using a Hawke Mil-dot reticle, use the Generic Mil-dot reticle and calibrate it yourself with the tools provided.
    Personally, I think that enabling ChairGun to be used with other manufacturer's Mil-dot scopes is a pretty magnanimous gesture from Deben - though it'll always be easier to blame the software than to read the help-file. :)

    George
     
  12. Pidlar

    Pidlar Big Poster

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    Interesting point about the ret choice on istrelok. I may be looking to buy a Bushnell in the future, what reticle does it have?
    Regards,Stu

    [​IMG]

    This is the Bushnell generic Mildot on istrelok if it isn't one of the other ones on the list.
     
    Last edited: Jun 30, 2015
  13. Darren82744

    Darren82744 Well-Known Member

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    Darren, you seem to know a bit!
    does this in turn mean at 6 mag, one space = the same as two mill dots in the Hawke Chairgun world?
     
  14. broekzwans

    broekzwans Member

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    At 14x magnification with the bushnell legend, the mildot spacing is the same as the 10x of (most) hawkes. So at 7x magnification it'll be 2 times the spacing of a hawke that is calibrated at 10x, so the same as 2 dots spacing yes
     
  15. broekzwans

    broekzwans Member

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    You can chose different reticles. I chose the mildot which looks like the picture you've added, but than with even spacing between mildots and the thicker section in the reticle :p. The thicker section also looks exactly like an the picture if you look through the scope, so no flat ending of the mildots but more an arrow shape which is nice I think
     
  16. 177

    177 Donator

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    If you run a search on here you will find more than one example where software table data has not matched the reticle view data, with or without reading a help file.

    One thing I don't understand is this: assuming you have the time to hunt, that means you have the time to test your rig in field conditions. Once you have it zero'd at your chosen range, mapping your mil dots, BDC points or any other MAP ret takes minutes unless you want to do it using a variety of different zoom settings.

    Range shooting will tell you in a few minutes exactly what software and endless posts often cannot do.

    Software as a model is fine, especially when it's bang on. Shooting your rig gives you exactly the feedback you need in real time - I did that last night with my rimfire using a Nikon mil dot scope on 10x which software said would give one set of results which shooting the rig disproved. I'll go with the results of putting rounds downrange every time.

    At the risk of stating the obvious if the software is right, it's right, and anything else means it isn't, regardless of user inputs.

    Assuming you dial your zero at your chosen range, where the pellet/bullet lands at other ranges is where it lands. Make a note of it then go out shooting...

    :)
     
  17. terry1001

    terry1001 Major Poster

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    As 177 says you have to check by shooting. Chairgun is Hawke software and built around their products, you can use it for other makes of scope but you have to be very careful. With other software you may find your exact reticle or maybe not but anything you get from it will need more careful checks by shooting.
    With Chairgun and Hawke scopes you may think that you're going to get good results and that is normally the case BUT you have to make sure that the magnification on the scope is correct, just lining up the '10' and the dot does NOT mean that you will have exactly 10x magnification although it will hopefully be close. With a fixed power scope you're more likely to strike lucky.
    You can check your mil dots from Chairgun so you should be able to find the actual setting for 10x etc or you can adjust your scope zoom setting until the results from shooting agree with the software which then means you can rely on other aspects of the software but the easiest way to sort it out is to set your zoom where you want to shoot and leave it there and check/map your aim points on the range.
     
  18. Gunfun

    Gunfun Engaging Member

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    Just check the calibration of your mildots yourself, it only takes 15 minutes, a pen, piece of A4, a ruler and a tape rule.
    Here's how -
    Given the distance between 2 mildots at 20 meters is 20mm, then 10 mildots (standard mildot reticle) equals 200mm.
    1) Draw 2 horizontal lines 200mm apart on the piece of A4.
    2) Measure accurately 20 meters distance from your scope position and secure the piece of A4.
    3) Secure independently the scope/rifle with the scope looking at the horizontal lines.
    4) Adjust scopes zoom ring until 10 mildots aligne with the horizontal lines on the piece of A4.
    5) Mark scope zoom ring for future reference.

    You should easily be able to get +/- 2% calibration accuracy using this method.
    I have found some scopes can vary between manufacturer stated 'true' Mildot magnification and actual, it all helps confidence/accuracy if checked and known.

    The picture is a 20 meter mildot calibration chart I drew on a piece of plastic.
     
    Last edited: Jul 1, 2015
  19. 18 Wheeler

    18 Wheeler Busy Member

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    As Gunfun suggests, this is the best way to know that your mildots are "true" and allow easy comparison between scopes.

    Before you start check your reticle focus, and parallax setting. These shouldn't make a difference but it's best to set the scope up as you use it and reduce any variables.

    -Be as accurate as possible with all your measurements. Distance to target, use a tape measure rather than a range finder and be precise with your reticle/target alignment. A fully stable rest is essential IMO.

    -Use the widest spread of mildots on your scope, ideally 10 as gunfun suggests, ensure the target and scope's objective are parallel too.
    [I do mine at 50 yards using a stick with 2 pieces of masking tape at 18" apart~ using more dots and maximising target range reduces the effect of any measuring and target/reticle alignment issues].

    -Once you've "calibrated" your mag ring for true dots it's worthwhile doing convenient fractions. [Eg true @10x and then repeat for 5x (each space now represents 2 true mildots) etc].

    Here's my imperial version of gunfun's metric method. I've assumed that a mil represents 3.6" @ 100 yards, there's more than 1 Mildot standard (Russian/NATO/U.S and more), but most of us use the 3.6"/100yd measure.

    [​IMG]
     
    Last edited: Jul 1, 2015

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