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When things don't compute

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  #1  
Unread 03-08-2013, 09:23 PM
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Join Date: Mar 2011
Location: Tennessee
Posts: 388
When things don't compute

My load, according to my chronograph with 162 A-max is 2900fps. That is fine and what it should be with my load but. With a 200 yd zero, The drop chart said to come up 7moa for 500 yards and that is low. Have to come up to 8.25 moa to hit center. To get a drop chart to works at 500, the fps has to be 2700 with a 8.25 moa. Why does it not compute right at 2900fps?
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  •   #2  
    Unread 03-08-2013, 09:34 PM
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    Join Date: Jan 2009
    Location: Centre County, Pa
    Posts: 238
    Re: When things don't compute

    That is the reason behind doing range varification!! The chrono graph is a good way to get an idea of the speed your bullet is traveling, but in most instances will not matchup in the field and will need to be tweaked up or down to match your drops. If one was to chrono there perticular load then just go hunting for instance you might be fine for the first couple hundred yards but the further out you went the further off target you would be and get very frustrated!! Now that you have your corrected velocity to match up with your 500 yard drops, go out and test it a little further out and see where you are at should be very close. Hope this helps!
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      #3  
    Unread 03-08-2013, 09:41 PM
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    Join Date: Apr 2010
    Location: ND
    Posts: 408
    Re: When things don't compute

    And you should check the elevation clicks to make sure they are what they are supposed to be.
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      #4  
    Unread 03-08-2013, 10:17 PM
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    Join Date: Feb 2013
    Posts: 912
    Re: When things don't compute

    Only trust your cronograph and click value so much until you have verified their accuracy. You're on the right track. Practice your drop chart or computed should hit to did hit data at various ranges and adjust your charts/programs to as closely as possible to where they match the actual drop.
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      #5  
    Unread 03-08-2013, 10:24 PM
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    Join Date: Aug 2008
    Location: east central fl. /n.c. pa.
    Posts: 808
    Re: When things don't compute

    sorta like those gas milage stickers on car windows.
    they lie also.
    trust what you see not what youve been told.
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      #6  
    Unread 03-08-2013, 10:51 PM
    Bronze Member
     
    Join Date: Mar 2013
    Location: Casper
    Posts: 85
    Re: When things don't compute

    Some of that deviation could be attributed to a variation in the bullets BC, could it not?
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      #7  
    Unread 03-08-2013, 10:59 PM
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    Join Date: Sep 2005
    Location: Central AZ
    Posts: 1,136
    Re: When things don't compute

    Exactly my thought. What bullet are you shooting?
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