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Thread: Calculating front sight height ? ( maths heavy )

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  1. #1
    Member
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    Feb 2020
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    Quote Originally Posted by akaroa1 View Post
    Bigger brains than mine required for this one

    I have just restored a Sharps 1859 Civil War Carbine
    It still had the original carbine rear sight ( which is a very challenging POS )
    I installed a circe 1873 front sight from another rifle
    The rifle has passed proof and shoots an OK group considering the POS rear sight

    But it is grouping 150mm above where I would like it to be

    So here are the numbers

    Range 25 meters

    Group wants to shift Down 150 mm

    Sight Radius is 530 mm

    How do I calculate accurately how much to build up the front sight blade to lower the groups point of impact by the required 150mm

    This will be a good formula to have on file because many of the old military and sporting carbines tent to shoot very high anyway

    Cheers
    Stuff the formulas, solution is to put a big zip tie on the barrel with the end being vertical.

    Use it as a front post and keep cutting it till you get the right height.

    Good luck.
    Moa Hunter and m101a1 like this.

  2. #2
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    Sep 2013
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    Tasman
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    3.47769mm
    Sorry. Just realised I used 25 yards, not meters.
    Experience. What you get just after you needed it.

  3. #3
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    So it will be a small piece of brass stuck on with Loctite 401

  4. #4
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    Thanks team

    First job after lunch and I will post the point of impact results
    Shearer likes this.

  5. #5
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    Quote Originally Posted by caberslash View Post
    Stuff the formulas, solution is to put a big zip tie on the barrel with the end being vertical.

    Use it as a front post and keep cutting it till you get the right height.

    Good luck.
    I also like this idea of there is no existing front sight and you can choose from the hoard that is similar to the cable tie

 

 

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