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  1. #1
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    Ballistic Calculator - for unknown Ballistic Coefficient

    Many times I have tried to sight in a BPCR or some other old rifle with a bullet where the Ballistic Coefficient is unknown - and have wasted a lot of time and precious bullets just trying to get the bullet on paper. Most calculators require the input of a ballistic coefficient number to make a reliable calculation. Guessing at that number is often futile and gives you unreliable data.

    This one simply requires input of a bullet diameter and weight instead and calculates a coefficient that works OK. I have used it as sight-in prep for several old rifles and have found it to be close enough for gubment work and my purposes out to 200 yds. - and has saved me a lot of aggravation on the bench.

    http://www.handloads.com/calc/

    It will also give you a quick look for those times when you plan to swap sights or scope mounts on a rifle and want to see how it will affect P.O.I. at known distances.

    xtm

  2. #2
    Gizamo
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    Re: Ballistic Calculator - for unknown Ballistic Coefficient

    BPCR rifles tend to shoot very expensive and heavy lead bullets. I can see how this would be very useful in sighting in at longer ranges... Knowing you, you must keep a log of sight elevations for your various loads, once you dial them in...

    Steve

  3. #3
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    Re: Ballistic Calculator - for unknown Ballistic Coefficient

    Quote Originally Posted by Gizamo
    ...you must keep a log of sight elevations for your various loads, once you dial them in...
    Not only that, I make little drawings of the sight settings with pertinent marks, etc. - and little drawings of the sight picture, too. I really hate to re-do something that I spent a lot of time working on... When you have a bunch of guns, you tend to forget these things about specific ones over time.

    xtm

  4. #4
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    Re: Ballistic Calculator - for unknown Ballistic Coefficient

    Thanks xtm I am saving that page!!
    Let go of anything that stops you from having everything…DM

    Dom






 

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