scope adjustments?

This is a discussion on scope adjustments? within the Optics forums, part of the Sniping Related category; if your rifle is zeroed at 100 yards how do you adjust the dials for longer ranges?...

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  1. #1
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    scope adjustments?

    if your rifle is zeroed at 100 yards how do you adjust the dials for longer ranges?

  2. #2
    Senior Member 6.5man's Avatar
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    Re: scope adjustments?

    Depends on the scope. If you have "tactical" or "target" turrets, then you can just reach up to the scope and turn the knob to raise the impact of the bullet. On most scopes there are 1/4 MOA per click, or at 100 yards this will be 1/4 inch per click, 1/2" @ 200 yards etc etc..
    A lot of hunting scopes have covers over the adjustments and you'd need a coin, key, or something else with a flat surface to adjust it.

    Target turret:


    Standard adjustment


    It helps to have a range card for the ammo and rifle you are using. Range cards will tell you how much you need to adjust your scope depending on the drop of the bullet and the range you're shooting to.
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  3. #3
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    Re: scope adjustments?

    ok, thank's , but on a ballistics/range card it gives info for whole yards like 100yds,200yds ect,ect. so how would you figure for say a target at 733yds?

  4. #4
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    Re: scope adjustments?

    Those are generic cards which I wouldn't use. They might get you close but probably not too close.

    Go to JBM Ballictics, which is a free online ballistics calculator, and input your info. You can have it give you data in any range increments. I do every 10 yards for matches but most use 25 yards. It also allows you to give the out put in whatever your scope adjusts in whether it be MOA, Mils or IPHY.

  5. #5
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    Re: scope adjustments?

    +1 for Rob01 reply.
    We have a custom in house calculator but to tell you the truth the JBM is right on par with the one we use. To be used a tool to get you pretty dead nuts on the JBM is the way to go- not to mention it's free!
    Paul

  6. #6
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    Re: scope adjustments?

    To be accurate at that range, You will really need to make a very good zero at 100yds and then either make some long shots, at least 500yds and better at 800yds and measure the drop or zero scope at that range and calculate the drop. Then you adjust your inputed velocity/coefficient until you get the program to match your actual shots. After doing this, it will accurately calculate the windage and elevation at almost any range. If you don't do this, the program is still only making a calculated guess. It can only get as close as the info you put in.

  7. #7
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    Re: scope adjustments?

    If you have or have access to a chronograph then it will do the same thing as shooting to longer distances. Take your velocity and put it into JBM with the other inputs. I use JBM alot and have never been off more than .2 mils at 1000 yards which is about 7". You put good info in JBM and you will get good info out.

    Another variable which people don't think about is whether your scope tracks correctly. Do a tracking test to make sure. I test every new scope I get to make sure it tracks correctly. If a scope doesn't track correctly then ballistic programs will be off as it gives you the correct data for inputted values but if the scope is off then you won't be dialing those values.

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